Air Con Service Manual

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Content

Service manual
Room airconditioner
Split Wall-Mounted Type

NOTE:
Before servicing the unit, please read this first
Always contact with your service center if meet
problem.

1

Table of Contents
1、Summary ………………………………………………………………………………………………………………3
2、Model explaining …………………………………………………………………………………………………….4
3、Installation……………………………………………………………………………………………………………..4
4、Exploded view and part list………………………………………………………………………………………..8
5、Operation principle………………………………………………………………………………………………….9
6、Specifications…………………………………………………………………………………………………………10
7、Wiring diagrams……………………………………………………………………………………………………...11
8、PCB principle chart……………………………………………………………………………………………….....16
9、PCB function …………………………………………………………………………………......17
10、Troubleshooting………………………………………………………………………………....33

2

1. Summary
1.1 indoor unit

Model 38B

model 85

1.2 outdoor unit

9000BTU

12000~18000 BTU

22000 BTU

24000~26000 BTU

3

2、Model explaining

c
Improve an ordinal number
Divide the body outdoors box a body code
External appearance characteristic code
Separately the body indoor machine(or whole type) style code
Separately the body pit code inside the indoor machine(or whole
type)

Code of refrigerant type:no code - R22;C-R407c、A-R410a

Power type:1:115v/60Hz 2:220V/60Hz;3:220-240V/
50Hz;4:240V/50Hz;
Main function code: c-Cold breeze type;H-Hot pump type;A-Hot
pump the type take assistance electricity to heat;E-The electricity
heat
Capacity code: x1000W
Structure form code
Special craft code:Q-Deal with contact quickly;S-Soft start;dOutside tube in addition to frost
The weather type code(T1 type code abridge)

"C" CHIGO brand
Such as: CS-25C3A-V85AY1
T1 climate type,wall split type air conditioner, cooling capacity is 2500W,power is 220V~/50Hz/1PH,
refrigeration is R410A,the kernel of indoor unit is fresh 98,the pattern no. is 85,first time design, outdoor unit is 1HP
of 2003 year。
Indoor unit modle is:CS-25C3A-V85A,outdoor unit model is:CS-25C3A-Y1。

4

3. Attention of installation
3.1 Safety Precaution
■To prevent injury to the user or other people and property damage, the following instructions must be followed.
■Incorrect operation due to ignoring instruction will cause harm or damage.
■Before service unit, be sure to read this service manual at first.

3.2 Warning
﹥Installation

■Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated circuit.
There is risk of fire or electric shock.

■For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized service center.
Do not disassemble or repair the product, there is risk of fire or electric shock.

■Always ground the product.
There is risk of fire or electric shock.

■Install the panel and the cover of control box securely.
There is risk of fire of electric shock.

■Always install a dedicated circuit and breaker.
Improper wiring or installation may cause fore or electric shock.

■Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.

■Do not modify or extend the power cable.
There is risk of fire or electric shock.

■Do not install, remove, or reinstall the unit by yourself (customer).
There is risk of fire, electric shock, explosion, or injury.

■Be caution when unpacking and installing the product.
Sharp edges could cause injury, be especially careful of the case edges and the fins on the condenser and evaporator.



For installation, always contact the dealer or an Authorized service center.

There is risk of fire, electric shock, explosion, or injury.

■Do not install the product on a defective installation stand.
It may cause injury, accident, or damage to the product.
5

■Be sure the installation area does not deteriorate with age.
If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and personal injury.

■Do not let the air conditioner run for a long time when the humidity is very high and a door or a windows is left open.
Moisture may condense and wet or damage furniture.

■Take care to ensure that power cable could not be pulled out or damaged during operation.
There is risk of fire or electric shock.



Do not place anything on the power cable.
There is risk of fire or electric shock.

■Do not plug or unplug the power supply plug during operation.
There is risk of fire or electric shock.

■Do not touch (operation) the product with wet hands.
There is risk of fire or electric shock.

■Do not place a heater or other appliance near the power cable.
There is risk of fire and electric shock.

■Do not allow water to run into electric parts.
It may cause fire, failure of the product, or electric shock.

■Do not store or use flammable gas or combustible near the product.
There is risk of fire or failure of product.



Do not use the product in a tightly closed space for a long time.
Oxygen deficiency could occur.

■When flammable gas leaks, turn off the gas and open a window for ventilation before turn the product on.
Do not use the telephone or turn switches on or off. There is risk of explosion or fire.

■If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the power supply cable.
There is risk of electric shock or fire.

■Stop operation and close the window in storm or hurricane. If possible, remove the product from the window before the hurricane
arrives.
There is risk of property damage, failure of product, or electric shock.

■Do not open the inlet grill of the product during operation. (Do not touch the electrostatic filter, if the unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.

■When the product is soaked (flooded or submerged), contact an Authorized service center.
There is risk of fire or electric shock.

■Be caution that water could not enter the product.
6

There is risk of fire, electric shock, or product damage.

■Ventilate the product from time to time when operating it together with a stove, etc.
There is risk of fire or electric shock.

■Turn the main power off when cleaning or maintaining the product.
There is risk of electric shock.

■When the product is not be used for a long time, disconnect the power supply plug or turn off the breaker.
There is risk of product damage or failure, or unintended operation.

■Take care to ensure that nobody could step on or fall onto the outdoor unit.
This could result in personal injury and product damage.

﹥CAUTION

■Always check for gas (refrigerant) leakage after installation or repair of product.
Low refrigerant levels may cause failure of product.

■Install the drain hose to ensure that water is drained away properly.
A bad connection may cause water leakage.

■Keep level even when installing the product.
To avoid vibration of water leakage.

■Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods.
It may cause a problem for your neighbors.

■Use two or more people to lift and transport the product.
Avoid personal injury.

■Do not install the product where it will be exposed to sea wind (salt spray) directly.
It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could cause product malfunction or
inefficient operation.

﹥Operational

■Do not expose the skin directly to cool air for long periods of time. (Do not sit in the draft).
This could harm to your health.



Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a consumer air conditioner, not a
precision refrigerant system.
There is risk of damage or loss of property.



Do not block the inlet or outlet of air flow.
It may cause product failure.
7

■Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
There is risk of fire, electric shock, or damage to the plastic parts of the product.



Do not touch the metal parts of the product when removing the air filter. They are very sharp.
There is risk of personal injury.



Do not step on pr put anything on the product. (outdoor units)
There is risk of personal injury and failure of product.

■Always insert the filter securely. Clean the filter every two weeks or more often if necessary.
A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage.

■Do not insert hands or other object through air inlet or outlet while the product is operated.
There are sharp and moving parts that could cause personal injury.



Do not drink the water drained from the product.

It is not sanitary could cause serious health issues.

■Use a firm stool or ladder when cleaning or maintaining the product.
Be careful and avoid personal injury.

■Replace the all batteries in the remote control with new ones of the same type. Do not mix old and mew batteries or different types of
batteries.
There is risk of fire or explosion.



Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
They may burn of explode.



If the liquid from the batteries gets onto your skin or clothes, wash it well with clean water. Do not use the remote of the batteries have
leaked.
The chemical in batteries could cause burns or other health hazards.

3.3 Installation details



Wrench torque sheet for installation

Outside diameter

Torque

mm

inch

Kg.m

φ6.35

1/4

1.8

φ9.52

3/8

4.2

φ12.7

1/2

5.5

φ15.88

5/8

6.6

φ19.05

3/4

6.6

8

■Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.

Grade
Unit

7K

9K

12K

18K

24K

28K

mm2

1.0

1.0

1.5

2.5

2.5

2.5

■ Pipe length and the elevation
Standard length
Capacity

Max.

Max.

Additional

Elevation

Elevation

refrigerant

B (m)

A (m)

(g/m)

Pipe size
(m)

Btu/h

GAS

LIQUID

9K-12K

3/8’’ (φ9.52)

1/4’’ (φ6.35)

3.5

5

10

30

18K-22K

1/2’’ (φ12.7)

1/4’’ (φ6.35)

4

10

15

30

24K-28K

5/8’’ (φ15.88)

3/8’’ (φ9.52)

5

15

20

65

Caution:Capacity is base on standard length and maximum allowance length is base of reliability.Oil
trap should be install per 5-7 meters.

4、Indoor unit and outdoor unit explosion diagram and spare parts list(see explosion diagram file)

5. Refrigerant cycle diagram
5.1 Cooling only

9

5.2 Heat pump mode

6. Specifications (see spec sheet)
10

7.Wiring diagrams
7.1Indoor unit

11

12

13

14

7.2 Outdoor unit

15

8.PCB principle chart
8.1、38 section of crystal color ordinary schematic diagram
3

4

B

E1

C13
10 4

8

P07

30

20

X3A

13

4

P32

GND

P33
C15
10 2

HSTP.0

B
16

电加热

26

P12

D11

GND

41 48

外风 机
X4A

FM O

15

外风 机

2

52 X4B

P11

Q 5 制热

5

DATA

GND

4

D7

41 48

IC1
R8
4. 7 K

R9
4. 7 K

74 AL S1 64

电 加 热 /无

HSTP.1

32

R13

IN41 48

18 15

4. 7 K

4. 7 K

R7

B

L1

C24

U2

GND

GND

8
R6

4. 7 K

P00

+5

2

Q7
18 15

GND

13

P34

1

XL
8. 0 0

R20
4. 3 K

C8
10 4

GND

GND

3

R17

51 0

P20/AN0

R18
4. 3 k

Vss
C6
10 4

15

3

4. 7 K

R22

GND

P14

R21
C18
10 1

14

10 K

4. 7 K

GND

C10
10 2

+5

GND

INT0
16

R4

10 K

10 K

产品 名称

AC..ZERO
R2









5

GND
GND
6

8.2、65 Mitsubishi main chip schematic diagram

16

22 UF/1 6V

(37544)38款晶彩普通电 控 原 理 图


A



姚贤 清

批 准

杜娟

日 期

4. 7 K

标准 化
Q1
C18 15

10 2

4

E1

1

GND

10 2

C5

HS 0 0 3 8

R1 51

GND

C11

GND
3

GND

C19
10 4

R3

22

GND

3
2
1

2

GND CNW

R5
4. 7 K

4

GND
2

+5

风机 反馈

5

P37

GND

B

LED
DPY-8 *2

dp

RMT

S
1 GN D
3 +5 V

CNTR0
Xin

f

b
c

d

S

3

R24 10 K
R23

P30

2

CN D

+5
+5V

30 0K

Tp 管

GND

11

R15

P21/AN1

GND
GND

10 uf/1 6F

4. 7 K

C12
10 2

51 0

CO M2

GND

-+

R19

a
a
g

e

10 4

GND
17

Xout

GND

h
f

dp

接收头
R35

12

+5

g

b
c

d

21

C14
10 2

/RESET

g

e

E5

51 0

R38
10 K

7

10

SW 1

GND

b
a

2

Vcc
C4

R16
10 K

GND
R25

R39
10 K

c
f

6

应急 键

d

R31
4. 7 K

Q8
9012

2

e

COM2

P22

+5

E8
1u F/5 0V

C7
10 4

6

1

MC3 02 1

C9
10 4

23

com2

R37 33 0

R34
2K

4

CO M3

com1

4

+5

1

6

Q5
90 12

R11

P24

L E D5

R30
4. 7 K

R14
39 0
IC5

3

CNG
TEMP

3

D2

L E D3

4. 7 K

3
2 BCR

R36
22 0

+5

10 2

+5

IC6

L E D4

L E D7

COM3

3

1

D1

4. 7 K

2

C20
47 3/2 75 V

L E D6

4. 7 K

Q6
90 12

R12

P25

24

1

N

改为 跳 线 , 保 留 孔 位
CFI
1. 2 uF

1

9

BUZZ

P01

1

R32

S

C23
10 4/2 75 V

L E D2

CO M1

L E D1

COM1

+5

Q2

2K

CNU

Q4
90 12

P02 25

90 13

GND

R5

8

D6

R33

+5

4. 7 K

52 CB

Q3

R6

压机

BZ

41 48

D8

R10

GND

C

R9

D10 41 48

41 48

R2

D12

8
7 P23

R8

P13

51 0* 8

R4

2

+5

TYPE1.1

dhon/off

31

14

41 48

R3

P10

3

52 X5B

JZC-7F*2

Tr 室

102

+5
TYPE1.0
heat/cool

D9

Q 3 通风

102

R7

14
换向阀

A

51

C16
10 2

FM C

B

R26

CLOCK

3

1

51

单 冷 / 双温

P03

1

52 X6B

R27

C2

9

4

19

P31

C3

8

29

C28
10 2

Q7

P06

Q 4 除湿

DA T A

7

5

Q 2 制冷
CL OC K

MR

28

5

Q6

12

3

步进电机

5

4

GND

Q 5 CL K

CN M

U1

C

AT 2 4 C0 2

4

13

P05

6

18

20 S

7

R28 4. 7 K

D

Q 7经 济 F

R11
10 K

12

11

电加热

四通阀

3
5

R12
10 K

R29 4. 7 K

2

52 X6A

6

CN1

1

+5
27

IC7

Q 1强 力 D

Vss

P04

7

GND

CN

2

MC2 00 3

10

1

10 4

1

A

Q 0 定时 E

Q4

9

C17

火线

七灯显 示 板
Q 6 运行

GND

+5

11

52 C-1A

配灵通3号遥控器

22 0UF/16V

+5

E4
22 UF/2 5F

2

CN

10 00 UF/35 V

JS2-B38aC-M15A/0

E3

C3
10 4

A

COM
CM

+5
3

OUT

CN4T

B
5

压机

Vin

C2
10 4

B

U2

JL C03 01

IN40 01

变压器

L2

U1
变压初级

火线 由 压 机 的 COM 端进 入

E2
C1
10 4 22 0UF/35V

Q3

1 0A

FUSE
F3 A 25 0V

1

D5

Q2

火线

51 /1W

D1-D4

C22
10 4/2 75

Q1

47 1
U

D

R1

AC.ZERO

T

JL C03 01
C21
10 4/2 75 V

6
10

L3

ZR

8

编号

5

零线

7

78 05

Q0

N

6

IC4

4

CNB
N1

5

变 压 器 次级

G ND

2

2

1

佛山市中格威电
7

子有限公 司
8

2

3

FU S E

火线

4

5

L1

FU S E +ZR

6

B

1 0 A- 1 8 0 - 6 2 1

R1

1

T1

CNC

8

编号

+5

Vin

51 /2W

CNB

2 5 0 V/3 .1 5 A

7

IC 6
7805

3

Vout

G ND

1

JS2-B65aC-M11A/0

E1

D1 -D 4

D

5 2 CB

1 10

低风

CN U

7

8
C2 2

1 0 0 /1 W

P3 0

E3
1 0 0 UF/2 5 V

GND

11

0 .1 u f/27 5 V

IC 2 F

18

6

CFO

4

高风

电 容

3 .5 UF/50 0 V

低风

X3 B

中风

X4 B

高风

X5 B

IC 2 E

12

P3 1

19

5

X2 A

P0 3

4

20

IC 3
2003

1

4. 7 K R13

26

10 3
C10

P3 3

16

IN 2 OUT 2

15

3

IN 3 OUT 3

14

4

IN 4 OUT 4

13

5

IN 5 OUT 5

12

6

IN 6 OUT 6

11

7

IN 7 OUT 7

10

8

COMCLAMP

9

X1 A

外风

IC 2 C

X2 B

机 FMO

2 14

换向 阀

X1 B

20S

5 2 X6 A

R1 6

9

NC

1

E1 0

DA 2
IN 4 1 4 8

DA 3
IN 4 1 4 8

DA 4
IN 4 1 4 8

DA 5
IN 4 1 4 8

DA 6
IN 4 1 4 8
*

R1 0

R8

4 .7 K

4 .7 K

R1 1

R9

4 .7 K

1

P1 0

4 .7 K
R7

+5

GND

R6

10K
P 11

3

4 .7 K

A

单冷


室外传感器化霜
双温
双温有电加热
外板化霜
数码管显示

DA 3
DA 4
AR 5

39 0Ω

R5

R4

6

4. 7 K

4. 7 K

7

R28

R29

8

IC 8

+5V

GND

COM 1

P2 3 / AN3

C7
10 2

90 12

COM 2

COM 1

P2 1

Q4

COM 2

GND1 0 0 UF/2 5 V

30

Vs s
P0 7

C1 9
104

SW1

GND

AR 5

金膜

E 10
22 UF/2 5V

(37544)诚 丰 65款主控/ 电 源板 原 理 图

产品 名称

可调 电 阻

GND

C2 0
104

GND

GND

16

Vr e f 1 0

4. 7 K
10 2
C9

90 12

C22
10 4





张建





范丽英

4

批 准
日 期

佛山市中格威电

GND
3

5

A





标准 化

M3 7 5 4 4 G2 ASP
+5

CN1

2

GND

R2

R2 4
10K

GND

E8
1 0 0 u f/25 V

10 2
C8

FE E D

外反 馈

7

13

Vc c

5

B

化霜

R2 3

+5

C4

+5

90 12

E4

1

R2 5 4 .7 k

R12GND

+5V

A0

*

Q3

C6
102

A1

VCC

1 0 0 u f/25 V 1 0* 4

P2 0

4. 7 K

DATA

WP

2

2 4 C0 2

R M T _IN

CLK

4
GND
3

SCL

4

DE FR OS T E R

2 0 0 K/2 W
D6
IN 4 0 0 7

C1 8

A2

SDA GND

E5
R3
4. 7 K

+5V

COM 3

1

5

31

Q2

39 0Ω

双温无电加热
智能化霜
灯板显示
化霜参数调节(请参看说明书)

DA 2

P1 4

32

103

+5V

C5
102

P 10

GND

DA 1

P1 1

P1 3

L

R2 2
2 0 0 K/2 W
D5
IN 4 0 0 7

IC 5

+5

P1 2

2

GND
104
AA

25 v

GND

10K

R2 6
4 .7 K

T YPE _ IN2

104

IC 4

R2 1

P0 6 2 9

金膜

C1 7

103

RE SE T

T YPE _ IN1

C2 3
E7
1 0 UF

GND

10K

R2 7

TR t。

室温

+5V

4 .7 K

R3 1 5 1 0 Ω
10K

GND




P2 2 / AN2 6

11
R3 4

R3 2
10K

P20

B
DA 1
IN 4 1 4 8

金膜

R1 9
4 .3 K C2 1

C1 6
104

R20

Q1
90 12

CN1 2 0

P21

R3 5
4 .7 K

t。

TP

管温

GND

4 .7 K

GND

AA

4 .7 u F/5 0 v

DA 5

R1 8
C1 5
104

R3 3
2K

8

P07

CN G1
R1 7
4 .3 K

C1 4
104

8

P0 0

CO M
5 2 CA

二极管

P2 4 / AN4

23

+5

C

104

+5

4 .7 K

C1 3
104

GND

7 16

压机

GND

C2 4

P3 7

IC 2 A
5 2 X6 B
电 加 热

R3 6

4 .3 K

GND

22

2

+5
BZ

R14

C1 2 1 0 4

GND
P2 5 / AN5

6 15

电加 热

B

CN M2

2 2 UF/25 V

P3 4

IC 2 B

换 向 阀

CNG2

CN M1

E6

R3 7
4 .7 K
*

21

3

T P2

管温 2

2K

CNVs s 1 2 GND

C

+12

IN 1 OUT 1

2

P3 2

IC 2 D

3 13

外风 机

步 进 电 机

GND

P0 5 2 8
27
P0 4
25
P0 2
24
P0 1

X5 A
电 容

R3 0
3 0 0 K XL 1
8M

15

Xo ut

6

中风

零线

17

C3
104

X4 A

R2 5

14

Xi n

B

CN
负离 子

GND

I C1

IC 2 G

X3 A

火线

t。

B

2003

CN 1
S2

4 7 0 u F/3 5 V

金膜

0 .1 UF/27 5 V

零线

C2
104

2 2 0 UF/2 5 V

40 07

9

D

E2

2

C1
104

C2 1
S1

6

子有限公 司

7

8

8.3、85 section of schematic diagrams
1

2

3

零线

1

2

4

3
变压 器



1

E1
10 00 UF/35 V

IN 4 0 0 7
D1 --D 4

次级



4 7 3 / 2 75 V

2K

C1

9

净化

R2

CNL

C30
10 4

E9
22 UF/1 6V

GND

X1A

换向 阀

CNG
T MP86 F80 9NG

30

CLAMPCOM

8

OUT 7 IN 7

7

11

OUT 6 IN 6

6

12

OUT 5 IN 5

5

15

13

4

16

OUT 4 IN 4

IW

U1

B

E2
22 0UF/25V

GND

C32

31

10 2

R47 4. 7 k

R27 10 K

X2A

电加 热

5 2 X4 A

F MO

外风 机

+5V
压机

L3
C3

N1

IC4

CF I
1 . 2 UF / 4 5 0 VAC
MF1

1

R1
220

内风 机

4

1

6

2

BT 13 1

IW

24

C20

C21

104

104

VD D 5

IC2

14

3

18

OUT 3 IN 3

15

2

25

OUT 2 IN 2

R3 0

10 4

4 .3 K

4 .3 K

10 4 C16

16

OUT 1 IN 1

GND

R32

P1 1

R25 4. 7 k

+5

7

10 2

19

C24
10 2

R9

20

GND

21

C9
10 2

10 4

R19

GND

5

+5

10 2

10 2

10 2

11

C33

12

CNE

10 4

R14

E9

C22

+5
+5

4

IC5

24 C02

8

A1

WP

7

SCL

6

A2

10 2
C29

GND SDA

4148

4148
D9

GND

D7

4148

4148

GND

R11

+5

GND

GND
R6

1
2

+5V

管温2

B

强制 按键

GND

5
R7

GND
C8
10 2

1 6 VC C
1 0 S CL R
9 Q H*

51
R5
4. 7 K

C10
10 2

G ND

GND
+5

CL OC K1 4 S I
DA T A 1 1 S CK
13 G
8
GN D

E5

QH 7
QG 6
QF 5
QE 4
QD 3
QC 2
QB 1
Q A 15

G ND

4 7 UF/25 V

M7 4 H5 9 5

3

4. 7k

10 4

IC16

16
15
14
13
12
11
10
9

IN 1OUT 1
IN 2OUT 2
IN 3OUT 3
IN 4OUT 4
IN 5OUT 5
IN 6OUT 6
IN 7OUT 7
COM
CLAMP

SW1

C7
10 2

GND

GND

GND

+5

RC K

+5

1
2
3
4
5
6
7
8

20 03

IC 1 3
12

51
Q1
90 13

2

10 K R41 R38 R35 R34

R4
4. 7 K

R12
4. 7 k* 2

C6

B
R39 R40 R37 R36

4148

10 2

A

1

R1 3
10k
R2 4

4. 7 K

R4 5

+5

VCC

4148
D1 1

C28

4 .7 k

+5V

A0

D8

D1 0

R2 9
4 .3 K

10 4

C18
10 4

10 k* 5

R4 4

4 .7 k
1 0 0 uF/ 2 5 V
E6

D1 2

+5

22 UF/1 6V

3

R17 R16

CNP

+5V

GND
GND

2

9

13

10 4

GND

1

R15 R18

GND
R28 10 K

32

1
C36

E 7 4 .7 UF/50 V

RE S E T 8

10
C11

IN 4 1 4 8
D6

28

R23
C12

GND

GND
R4 3
10K

R22

4

2

+5

2

29
22 0* 3

6

B

XI N

XL

C14
10 2

Z
R8
4. 7 K

10 3
RX
8M
30 0K

26

22 0 R20
C37

10 K

C27

XO UT 3

27

C

GND

Q2
18 15
C26 10 2

R21 22 0

C13

GND

GND

R42 10 K

P1 0 2 2

C34

1

C15
10 2

R10
4. 7 K

+5

2

10 2

GND

CNM

3

10 k

GND

23

14

1

+5

GND

C19

E 3 1 0 0 UF/2 5 V

GND

+5
10 0UF/25V

TE ST 4

GND

4 7 3 / 2 75 V

3

+5V

R3 1

C17

E8

C31
10 4

6

R4 6
390

C3 5

52 CA

B

R3
330

1 0 4 / 2 75 V

5

C

52 X6A

U1

X5B

室温

17

P1 2

VS S 1

FMC

管温

R26 10 K

GND GND

H F 2 16 0-1A -1 2D E

外风 机
220

5 2 X5 A
20S

JS2-B85aC-T01A/0

3

20 03

IC14

10

电加 热

四通阀

OUT

IC1

R3 3

U

COM

B

Vin

C25
10 4

10 4

C23

B
BZ

COM

B

9 5 3 -1 A
5 2 X6

HE AT NO

X 5B

CN A

U

火线

X5A

5 2 C (12 V )
NO

8

编号

D

负离子

CM

7

+5

7805

U1

S1

压机

6

IC 5

IN 4 0 0 7

10 4/2 75 V
10 4/2 75 V EF - 1 0 05 GS1

2
1

CN C

T RANS
C2

C1

S

B

D5

G ND

ZR
CN1

5

Z

CN B

L

FUSE

D

4

U1

62 1-1 0-12 6

2

3. 1 5A 2 50V

火线 U

1
2
3
4
5
6
7
8

IC15 20 03

IN 1OUT 1
IN 2OUT 2
IN 3OUT 3
IN 4OUT 4
IN 5OUT 5
IN 6OUT 6
IN 7OUT 7
COM
CLAMP

16
15
14
13
12
11
10
9

CNM2

B

E4

CNM1

B

CNM

产品 名称

M70 内核东 芝 809 芯片85款(简易 三 灯 )
电 控 原理 图









批 准

B

日 期

标准 化

B
1 0 0 UF/2 5 V
C5

GND
4

10 4

佛山市中格威电
5

6

A





7

子有限公 司
8

8.4、Three water chestnut 18NV 85 section of entire compatible electrically controlled schematic diagrams
17

1

2

3

4

5

6

7

B
U1

L

Vin

4

3

1

2

D1 - D4
4001
C1 2
1 0 4 / 2 75

AC- N

编号

3

OUT

JS2-B85AC-M01A/0

GN D

L1

火线 由 压 机 的 ON端引人

8

+5
1

安规 电 容

E1

C1

I C4
7805

C2
10 4

E1

E3

2

F USE+ ZR

F USE

C3
104

4 7 0 UF / 2 5 V
T RANS

1 0 0 0 UF/ 3 5 V

1 0 4 4 7 0 UF / 5 0 V

零线

D

D

N
HI

IC1

U1

X3 B

B

GND

C5

IC1
X4 B

MI D

I C4C 9

B

MF1

低风

X5 B

中风

X4 B

P07

14

R9

30

220

4148

D6

4 .7 K

P10

8 P2 4 / AN

3

高风

R1 0 2 2 0

31

4148

D7

D9

13

52 X6 B

X2 B

X1 B

换向阀

外风 机

2

X2 B

15
20 03

1
电加热

COM

52 X6 B

I C3B

L

压机

3

52 CB

16

火线

CN

UL 20 03

52 CB

COM

压机

火线

+5 V

CM
CN

C4

9
10
11
12
13
14
15
16

2




3



VC C

GND

QH 7
QG 6

10 4



9
10
11
12
13
14
15
16

1

CNM
GND

G

3



4

C2 2

C2 4

10 2

10 2

10 2

17

51

R4 7

51

P0 3

27

P0 4

P1 2

1

P1 1

32

1
GND

R11
4. 3 K

P2 1 / AN

R1 5

5

C10
10 2

+5

39 0

R1 2
4. 3K

GND

+5 V

P2 0 / AN

室温

28

P0 5

IC4F

6

2

P1 3

IC4E

3

5

20 03

B



t

3

铜头

R1 3
4. 3K

C1 1
10 4

R7 22 0

CNG 管温

C9
10 4

GND

IC5
+5
A T2 4C 0 2

R 40

R 39

4.7K

4.7K

8

P1 4 / CNTR0

1

2

6

3

E8
4.7u f/2 5F

7
4

5

GND

8

GND

E7
+5 V
GND

E 10

R44
2K

30 0K

14

1
R45
10 K

E6

2 2 SDA

R 3 51 0

Xi n

Vr e f

10

Vc c

13

+5 V

1 1 / RES ET
C1 2

22 uf / 2 5V

CN1 6 1

R46
10 K

GND

4. 7K

R2

Vs s

1 2 CNVs s

16

三菱(37544)18NV P型板85款全兼容电控原理图

产品 名称

R4 1

8. 00

GND

90 12

2 1 SCL

P3 7

XL
Q7

1u F/50 V

B

P3 4

1 5 Xo ut

10 0u F/25V

R6 10 0

1 泪滴

C8
10 4

R1 4

4

4 7 UF/16 V

12

5



t

2

C1 0
10 4

+5



10 4

E9

管温2

C7
10 4

4
E4

11

R5

C2 0

2
1

4. 7 K

GND 22 Uf / 5 0V

R8 4.7K

2K

CNG2

R4

6

GND

GND

BZ

E5

10 4









批 准

10 uf / 1 6v

日 期

标准 化
GND

GND

佛山市中格威电

GND
2

3

4

5

6

7

2

3

4

5

CN B

IN 4 0 0 7

变压器

FU S E

F3 .1 5 A 2 5 0 V AC
火线 由 压 机 的 COM 端进 入

U1

变压初级

IN 4 0 0 7

CN

5 2 C-1 A

C2 2
102

P11

32

26

4 .7 K

D8

P03

5 2 X6 A

P12

1

P13

2

25 P02

D1 5

B

31 P10

M C 20 03

B

X1 A

四通阀

X2 B

电加热

5 2 X6 B

P24

5

13

L1

压机

5 2 CB

外风机

X1 B

11

R2 6
220

1

C1
4 7 3 /2 75 V

1

1

P00 23

6

P23

7

P32

4

IC 4

+5

17
18

P01

2

P3 0
P3 1

10K

R19

10K

28 P05

24

2
1

GND

C2 4
104

Xout
P20

10K

P21

3

+5

4

C2 6
104

R3 2
4 .3 k

GND

Q1

R2 0 2 K

AC..ZERO
R3 0
10K

C1 1 1 0 K
102

C2 5
103

2

+5

+5

R2 1
4 .3 K

+5

C23
10 4

QD

QE

QF

1

2

3

4

5

IC2

7 QH

6

8

10
SCLR

RCK

R38
4. 7 K

QG

M74HC595

1
2

C5

16
VCC

B

G
90 13 Q4

13 GND
GND

+5

104

XH-2A

GND

GND

90 13 Q2

GND

10 VRE F

GND

C1 7
104

15

+5

E1
1 0 0 u F/1 6 V

R4
10K

4
5

29

P06

GND

R1 6

4 .7 K

S

P37

C1 8
102

产品 名称

+5
22

R3
10K

C1 0
102
3
16
Vss

CNW

+5

R3 1 4 .7 K

CNTR0
P14
C1 3
102

风机 反馈

GND

4

E2

GND
5







小分体电控原 理图( 0C314芯片)

C2 9
104







A



批 准
日 期

标准 化

佛山市中格威电
6

18


10 0μF/2 5V

GND
3

QC

12

R7
4. 7 K

CN1

R2 9 1 0 K

INT10

GND
GND

GND

11
S1 14

4. 7 K

GND
R2

C1 8 1 5

SCK 1 5
R13

R2 7
10K

GND
GND

GND
1

C2 0
104

R5

QB

13 Vcc

RX
300K

+5

GND
R1 4

R22

10 0

47 1

104
C1 9

14

10 0

C28

11 /RESET
Xin

XL
8 .0 0

GND

47 1

GND

Q3
9012

10K

E6
47 UF/2 5V

GND

C27

C7

2K
E3

GND

7
4

CLK
DATA

6 P22

104

510

5
4
3
2
1

B

E5
4 7 u f/2 5V

3

QA

GND

GND
R3 3

1uf/50V
C2 1
104

2

IC7 AT 2 4 C0 2

27 P04

R23

GND

1

5

15

R3 4

R36

+5

R1
R1 7
4 .3 K

8

R3 7 4 .7 K

6

P07 30

7

2K

TEMP

GND

CNM1

B

R1 8 4 .7 K
10

C

步 进 电 机内 风 门

+5

2

5
4
3
2
1

B

D1 6

GND

GND

A

步 进 电 机外 风 门

C16
10 2

GND

1

GND

C1 4
104

COM
CLAMP
IN 7OUT 7
IN 6OUT 6
IN 5OUT 5
IN 4OUT 4
IN 3OUT 3
IN 2OUT 2
IN 1OUT 1

R3 5 4 .7 K

R2 4
390

BC R

B

Tp 管

C12
10 2

C8
10 2

CNM

9
10
11
12
13
14
15
16

20 03

R1 0 2 2 0

IC1

0C314

IC5

4148

BZ

+5

QA
QB
QC
QD
QE
QF
QG

1
2
3
4
5
6

8
7
6
5
4
3
2
1

IC 9

B

Tr 室

CNE
XH-6A

+5
S
GND

R6 2 2 0

MC3 0 2 1

CNG

GND

DI

20 P33

12 CNVSS

R2 5 3 3 0 6

3

B

C15

4148

D9

R1 1 2 2 0

U1

3
2

D1 4 4 1 4 8

4148

WR

+5
CFI
1 .2 u F

TYPE1.1

dhon/off

3

N

5

16

C2
1 0 4 /2 75 V

电 加 热 /无

CS

21 P34

P25 9

4

D1 3 4 1 4 8

D1 2 4 1 4 8

10 4

19

外风机

D7

R9
R8
4 .7 K 4 .7 K

8

FM C

CNU

4148

9

GND
IC3 12

+5

TYPE1.0

heat/cool

E4
4 7 u F/2 5 V

四通阀

GND

R1 2
4 .7 K

D1 0 4 1 4 8

单 冷 / 双温

HSTP.1

C9 1 0 4

X2 A

FM O

D1 1 4 1 4 8

4148

HSTP.0

GND

C

E1 1
2 2 0 UF/2 5 V

D

GND S W 1

U1

JS2-B85aC-M01A/2

104

+5

R2 8

火线

8

编号

C6

R1 5
10K

H E AT

20 S

OUT

+5

应急 键

电加热

C4
104

E1 0

1 0 0 0 UF/3 5 V

变压器次级

COM
CM

压机

Vin

AC.ZERO
D1 2

D1 -D 4

2

D

T

3

2

ZR 6 2 1 -1 0-1 2 6

火线

L

7

+5

IC 8 7 8 0 5

1

1

零线

N

6

B

CN C

C3
1 0 4 /2 75 V AC

G ND

1

7

子有限公 司
8

8.5、Mitsubishi Jin dynasty 85 model of simple three lamp electrically controlled motherboards

N1

A





GND

1

C

2

GND
C8
10 2

HS 0 0 3 8
2 2 UF/16 V

3

P3 0

26

51

+5 V

SW1

GND

A 10 15

Q3

R1

C N 13 3

R2 2
10 k

强制按键

R4 6

3
2
1

E2
1 +5 V

1

RMT
S

3 GN D

GND

R2 3
10 k

+1 2V

20 03

6
S CN 1 2 3

C2 3

+5

8

M7 4 H5 9 5

8
7
6
5
4
3
2
1

AJ1



2

Q6
90 13
R45
4. 7 K

13

GN D

BB 5

BB

39 0

CLAM COM
P
OUT 7 IN 7
OUT 6 IN 6
OUT 5 IN 5
OUT 4 IN 4
OUT 3 IN 3
OUT 2 IN 2
OUT 1 IN 1

2



R36

P2 2 / AN

16

IC7

E7
22 uf / 2 5V

10 0

C6
10 4

S CL R 1 0
5
4
Q H* 9
3
2
1
14
15
CL OC K S I
DA T A S CK 1 1

QF
QE
QD
QC
QB
QA

B

B

25

AA

2

R44
4. 7 K

8
7
6
5
4
3
2
1

20 03 C5

5

P02

+5 V

CLAM COM
P
OUT 7 IN 7
OUT 6 IN 6
OUT 5 IN 5
OUT 4 IN 4
OUT 3 IN 3
OUT 2 IN 2
OUT 1 IN 1

4

R35

RC K 1 2

IC6

C N -AC

A

P3 1

10 0

+5 V

GND

10 4
B

B

18

24

IC 3

CN12

负离子

P3 2

20 03
I C3C

EF AN

HEAT

P3 3

19

23

P01

- +

FM C

20

3

P00

AA 4

ST B

14

X1 B

C

4

I C3D

外风 机

P23

R34

10 0

20 03

CNH

M37544G2SP

换向阀

7

4

20 03
I C3E
电加热

R3 2

D1 1 4 1 4 8

4148

4 .7 K
13

X3 B

CF I

VALVE

+5

R3 3

D1 0 4 1 4 8

9 P2 5 / AN

20 03
I C4E

CF

4148

D8

GND

20 03
I C4D

X5 B

LO

10 4
2

15

子有限公 司
8

9. PCB function:
NOTE: Ts is the set temperature, Tr is indoor room temperature, TP1 is indoor coil pipe temperature, TP2 is outdoor
coil pipe temperature.

Display panel
[1]only two LED
①running lamp(green):power on light, flash one time/ one second during anti cooled wind.
②timer lamp(yellow):only light at timer state.

[2]eleven LED
① running lamp(green):power on light, flash one time/ one second during anti cooled wind.
②temperature lamp(green):16~31℃ set temp. and room temp. display, light is set temp. flash is set temp.

[3]two LED and two 8LED

running

timer

① running lamp(green):power on light, flash one time/ one second during anti cooled wind.
② timer lamp(yellow):only light at timer state.
③8LED display set temp., also it can display timer time and failure code.

[4]LED multi-colour panel
①according to display mode: dehumidification, cooling, ventilation, heating, auto, sleep, fan speed, swing, timer, indoor
fan running.

19

Cooling


Start up the compressor: when the room temperature is more than Ts+1℃, compressor → start-up



Shut down the compressor: when the room temperature is less than or equal to the set temperature Ts-1℃,
compressor → shutdown



When the temperature of coil pipe of the indoor units is less than or equal to 1℃ for one minute and the
compressor has continuous run for more than ten minutes, the compressor and outdoor blower fan shut down
through the electric control board and the indoor blower fan is running at low speed.



When the temperature of coil pipe of the indoor units is more than or equal to 7℃ and the compressor has
shutdown for more than three minutes, the compressor and outdoor blower fan start to run and the indoor blower
fan is running at set speed.



When the temperature of coil pipe of the indoor units is equal to or less than -10℃ for three minutes in the
compressor has continuous run for three minutes, the compressor, indoor and outdoor blower fans and swinging
wind shut down. Restart up six minutes later; if the above situations appear again within six minutes, all the
outputs are shut down through the electric control board and display failure.



When you press turbo button of remote, the air conditioner enter turbo running, compressor and outdoor blower
fan turn on all along, indoor blower fan run at high speed, turbo indication is light.



After the compressor runs five minutes, the lamp flashes 4 times per six seconds or display E4 if the temperature
of indoor coil pips is more than 25℃ in the continuous 20 minutes. The controller will automatically shut down if
the temperature of indoor coil pips is more than 25℃ in another continuous 20 minutes, that is the abnormality
protection of outdoor units and the indicator lamp keeps its former state of flashing. If the temperature of indoor
coil pips is less than 25℃ in the second 20 minutes or the compressor shuts down, the electric control board will
store to the normal display and the time is restarted when starting up the compressor next time.

20

Tr

7¡ ã
C
1¡ ã
C
-10¡ ã
C

compr essor
out door
bl ower f an
door
bl ower f an

Tr

compr essor
door
bl ower f an

Heating (only applicable to heat pump units)


Start up the compressor: when the room temperature is less than Ts-1℃, compressor → start-up



Shut down the compressor: when the room temperature is more than or equal to the set temperature Ts+3℃,
21

compressor → shutdown



The electric heating start-up in the heating mode shall meet the following conditions: ① start up the compressor
and indoor blower fan ② none defrost ③ TP1< 49℃ ④Tr ≤20℃.



The electric heating shutdown in the heating mode shall meet one of the following conditions: ① shutdown
indoor blower fan ② Tr ≥ 23℃ ③ TP1≥50℃.



In the heating mode, the indoor flower fan can be set as high/ medium/ low /automatic running mode by remote
control however the anti cool air function is prior. In the heating mode, the anti cool air control function is to
control shutdown of the indoor blower fan by detecting the temperature of coil pipe of evaporator so as to attain
the purpose of preventing cold air from blowing.



For the waste heat emission function in the heating mode, in principle, the indoor blower fan shall be on for
fifteen seconds after the electric heating is closed.



When the temperature of coil pipe of indoor units is more than or equal to 56℃, the outdoor blower fan shuts
down and it enters the overload protection; when the temperature of coil pipe of indoor units is less than or equal
to 52℃, the outdoor blower fan starts up and it exit the overload protection.



When the temperature of coil pipe of indoor units rises to 63℃, the compressor and outdoor blower fan are closed
and two minutes later, the change valve is closed. The indoor blower fan is running at the set speed. Restart up six
minutes later; if the above situations appear again within ten minutes, all the outputs are shut down through the
electric control board and display failure.



When you press turbo button of remote, the air conditioner enter turbo running, compressor ,outdoor blower fan
and four-way valve turn on all along, indoor blower fan run at high speed and it must meet start condition, turbo
indication is light.



After the compressor runs five minutes, the lamp flashes 4 times per six seconds or display E4 if the temperature
of indoor coil pips is less than 30℃ (heating) in the continuous 20 minutes. The controller will automatically shut
down if the temperature of indoor coil pips is less than 30℃ in another continuous 20 minutes, that is the
abnormality protection of outdoor units and the indicator lamp keeps its former state of flashing.

22

Tr
Tr

+3
-1
over 6 MIN

COMPRESSOR
out door
bl ower f an

four-way
valve

bl ower f an

st ar t - up

st ar t - up

st ar t - up

st ar t - up

l ower l ow
speed speed

st ar t - up

st ar t - up

2 MIN

st ar t - up

l ower l ow
speed speed

l ow
speed

23

st ar t - up

2 MIN

st ar t - up

Tr
36

compr essor
door
bl ower f an

Defrost (only applicable to the heating mode)
1. the intelligent defrost
In the heating mode, the electric control board checks and compares the temperature of indoor room and indoor coil
pipe after the compressor works for a while; judge whether the outdoor heat exchanger part is frosted or not according to
conditions such as the change of indoor coil pipe temperature; if it is judged as frosted, it automatically enters defrosting
process. When defrosting, close the indoor and outdoor blower fan and four-way valve.
2. Outdoor PCB for defrost.
In the heating mode, the unit defrost by outdoor control board:
①unit start defrost shall all meet the following conditions:
a、compressor continuous running over 7 minutes;
b、defrost relay shut off;
(-5℃)
c、compressor cumulate running time over 50 minutes.;
②first defrost interval time is 50 minutes, later defrost interval time decided by last defrost time.
Defrost time(minute)

Next defrost interval time(minute)

15

30

10--15

40

7--10

60

3--7

70
24

80

≤3

(2)end defrost condition(meet one of follows)
a、defrost time have fifteen minutes.
b、defrost relay turn on;
(>8℃)
c、press ON/OFF key in defrost process.

3. Outdoor sensor for defrost
① unit start defrost shall meet one of the following conditions:
a.

compressor cumulate running time over 30 minutes and it continuous running over 3 minutes, the
temperature of coil pipe of the outdoor units is equal to or less than -15℃ for one minutes (Tp2≤-15℃).

b. compressor cumulate running time over 40 minutes and it continuous running over 3 minutes, the
temperature of coil pipe of the outdoor units is equal to or less than -5℃ for one minutes (Tp2≤-15℃).
c.

Air conditioner first power on or it wait over 30 minutes ,the temperature of coil pipe of the outdoor units is
equal to or less than -2℃ (Tp2≤-15℃)

②end defrost condition(meet one of follows)
a.

the temperature of coil pipe of the outdoor units is more than 15℃ (Tp2≥-15℃).

b. defrost time have fifteen minutes.

Tr

TP2

compr essor
out door
bl ower f an
door
bl ower f an

25

Tr

TP2

compr essor
out door
bl ower f an
door
bl ower f an

Tr

TP2

compr essor
out door
bl ower f an
door
bl ower f an

26

Tr

TP2

defrost time over 15 MIN or TP2 >15¡ ã
C

compr essor
out door
bl ower f an
door
bl ower f an



Sequence chart in defrosting mode
st ar t def r ost

end def r ost
def r ost

compr essor

st ar t - up shut down

out door
bl ower f an

st ar t - up

our - way
val ve

door
bl ower f an

st ar t - up

st ar t - up

st ar t - up

shut down

shut down

st ar t - up

st ar t - up

shut down

st ar t - up

shut down

st ar t - up

Dehumidification
Dehumidification running is to eliminate the water vapor in the air by using the cool circulating capacity, but the
dehumidification will not decrease the indoor temperature in great deal. The air conditioner automatically repeats on
and off circulation according the room temperature, which is shown in the following figure.
27

Tr

¡ ã
C
¡ ã
C
Tr ≤ 10℃

i ndoor
bl ower f an

l ow speed
f or bi d
dehumi di f y
st ar t - upshut down st ar t - up shut down shut down st ar t - up shut down st ar t - up shut down

door
shut down st ar t - up shut down shut down st ar t - up shut down st ar t - up shut down
bl ower f an st ar t - up
shut down



In the dehumidification mode, the indoor fan is running at the low speed for twenty seconds at first, then it select
working mode.

Ventilation working mode (only applicable to single cooling unit)
In the ventilation mode.When ventilating, the compressor, outdoor blower fan, four-way valve and electric heating are
all closed and the indoor blower fan is running at the set speed.

Tr

compr essor
out door
bl ower f an
door
bl ower f an

Automatic mode


Conditions for entering the automatic running mode are: After power-up for the first time, start up and select the
automatic operating mode of remote or press emergency key, the working mode depends on Tr and if the working
28

mode had set , it doesn’t change by Tr and the default set temperature is 25 ℃.

Tr

26¡ ã
C

21
25
mode

Time on and time off
When the time on or time off is used, the clock of remote controller shall be corresponding to the current clock and the
timing times is less than or equal to 24 hours, when the timing time is reached, unit will start-up or shutdown.
Sleep function
When the sleep key is press, air conditionerenter sleep state, indoorblower fan running at low speed, only sleep
indication display.
Emergency key function
There is a forcible execution key on the panel of indoor units and the air conditioner can run by pressing the key when
the remote control is out of work or missing.
When pressing down the forcible execution key, then power up and enter the self-check program.

Failure display
LED

lamp display
failure

code

explain

code

DF

display at

flicker 1/1

The reason of fault and solution

explain
defrost

29

Normal, the

defrost state is removed, it will return to

normal condition automatically

on state

SEC

display at

flicker 1/3

indication
1、 Normal (during heating mode )
anti cold wind

off state

SEC

2、It will be removed when the coil pipe temperature
sensor reaches certain temperature.
1、Check whether the resistance of the sensor is normal
(the resistance is 5КΩ in the normal temperature
25℃), when it is abnormal the sensor should be
replaced.

display at
display at

flicker 1/1

E2

room temp.
on/off

off state

SEC

2、Check whether there is short circuit or open circuit in
the wire of the sensor, and whether the plug is

sensor fault
state

connected well, whether there is welding off or
rosin joint on the electric control board, if there is
any, it should be repaired.
3、When the 1 and 2 are both normal, then the
components or integrated circuit is damaged, the
electric control board should be replaced.
1、Check whether the resistance of the sensor is normal
(the resistance is 5КΩ in the normal temperature
25℃), when it is abnormal the sensor should be
replaced.

display at
display at

flicker 3/5

E3

coil temp.
on/off

off state

SEC

2、Check whether there is short circuit or open circuit in
the wire of the sensor, and whether the plug is

sensor fault
state

connected well, whether there is welding off or
rosin joint on the electric control board, if there is
any, it should be repaired.
3 、 When the 1 and 2 are both normal, then the
components or integrated circuit is damaged, the
electric control board should be replaced.
1、 Check

whether

the

winding

resistance

and

operation current of the compressor are normal.
display at
display at

flicker 4/6

E4

outdoor unit
off state

on/off state

SEC

2、Check whether the high and low pressure is normal
when the unit is running.

abnormal

3、Check (whether the coil pipe sensor is normal)
whether the contact of the inserter on the circuit
board is well, the coil pipe temperature sensor is
fixed, the

30

evaporation of the indoor unit is well,

the key is to check the evaporator temperature
detected by the coil pipe temperature sensor has
reached the cooling or heating temperature.
4、Check whether the surface of the condenser is too
dirty, it should be cleaned when it is too dirty.
5、Check whether the capacitance of the outdoor motor
and the fan is damaged, it should be replaced when
it is damaged.
6、If the above items are normal, the electric control
board should be replaced.
1、Check whether two sets of plugs on the outlet end of
the motor have loosed from the socket of the
PG motor

no feedback
flicker 5/7

E5

display at

display at

2、Check whether the indoor motor has damaged, the
signal of indoor

SEC

off state

off state

electric control board, insert it firmly when loosing.

fan

motor should be replaced when it is damaged
3、 Check whether the controllable silicon and other
components on the electric control board have
damaged, replace the controllable silicon or electric
control board when they are damaged.
1、Firstly check whether the indoor fan is normal.

PG motor
E6

flicker 6/8

display at

no over zero

SEC

off state

signal

display at
off state

2、Check whether the signal outputting from the
integrated chip of the electric control board is
normal, the electric control board should be
replaced when the signal is abnormal.
1、Check whether the winding resistance and operation
current of the compressor are normal
2、Check whether the high and low pressure is normal
when the unit is running.

display at

flicker 7/9

display at

outdoor

3、Check whether the indoor and outdoor wiring is

off state

SEC

off state

feedback fault

right; when it is wrong, connect them again

E7

according to the circuit diagram
4、 Check whether the contact of the inserter on the
circuit board and the connection are well, otherwise
repair.
5、Check whether the signal feedback wire is

31

disconnected, replace or connect the feedback
signal wire.
6、Check whether the supply power is phase-lacking or
phase opposition.
7、Check whether the AC electromagnetic contactor is
well.
1、Check whether the filter of the indoor unit is dirty or
blocked, and clean if it is dirty.
2、Check whether the indoor fan is running normally,

frost
display at

flicker 8/10

display at

E8

and replace the motor if it is abnormal.
protection/over

off state

SEC

off state
heat protection

3、Check whether indoor pipe temperature sensor is
normal, and replace the sensor if it is abnormal.
4、Check whether the system pressure is normal, if
abnormal, should check whether there is leakage,
and fill the refrigerant again.

32

10. TROUBLE SHOOTING
Indoor Tr sensor
error

Is CN (Tr sensor connector)
connected properly?

NO
Connect CN properly.

YES

Is Tr sensor resistance value
(5KO at 25? ) normal?

NO
Replace TA sensor.

YES

Indoor P. C. board is defective.

Replace P. C. board.

Indoor TP1 sensor
error

Is CN (TP1 sensor connector)
connected properly?

NO
Connect CN properly.

YES

Is TP1 sensor resistance value
(5KO at 25? ) normal?

NO
Replace TC sensor.

YES

Indoor P. C. board is defective.

33

Replace P. C. board.

Only indoor fan motor does not operate.
<Primary check>
(1) Is it possible to detect the power supply voltage (200-240V) between L and N on the terminal
block?
(2) Does the indoor fan motor operate in cooling operation?
Turn off power
supply once, and
turn it on again.

Does
compressor
continue to
operate?

YES

NO

Is it possible to detect AC
220V between
pin(high/middle/low) and
pin(common) of motor
connector .

Start to operate indoor
unit in cooling
operation at airflow
level “ LOW” ,wait
three minutes..

Does indoor
fan operate?

NO

Replace main
P.C. board.

YES

NO

Turn off indoor unit and rotate
cross-flow fan by hand when the
unit is on standby.Is it possible to
rotate cross-flow fan by hand
properly?

NO

Replace
bearing.

NO

Replace
capacitor

YES
YES
Is capacitor of indoor fan ok?

YES
Fan motor
operates
normally.

Replace indoor
fan motor.

34

Compressor does not operate.
Turn on power supply.

Does OPERATION
indication indicate?

<Primary check>
(1) Is the room temperature higher than the preset temperature in cooling operation?
(2) Is the crossover cable connected properly?
NO
Check power supply.

YES
Does compressor delay
three minutes by
temperature changes or
others?

NO

Is resistance value of room
sensor (Tr) and heat exchanger
sensor (TP1) normal?

NO

Room sensor or heat
exchanger sensor is
defective.

YES
Replace room sensor
or heat exchanger
sensor.

YES
Wait three minutes

Is it possible to detect AC
220-240V on terminal
block or contactor of
compressor?

NO

Microcontroller is defective or
miniature relay is defective..

Replace P.C. board.

YES
Are all of compressor
cords normal?

NO

Rewire or replace
defective cords.

YES
Is compressor motor
winding normal?(Check
winding resistor.)

NO
Compressor is defective.

Replace compressor.

Capacitor is defective.

Replace capacitor.

Overload relay is defective.

Replace overload
relay.

Compressor is defective.

Replace compressor.

Gas shortage (Gas leak)

Supply gas.

YES
Is capacitor for
compressor normal?

NO

YES
NO
Is overload relay normal?
YES
NO
Does compressor start?
YES
Does compressor stop
after a while?
YES
Is gas quantity normal?
(Check gas pressure.)

NO

YES
Compressor is defective.

YES

Replace compressor.

35

Press START/STOP
button.

Is transmission
mark indicated?

The unit does not beep at all.
OPERATION indication on
indoor unit is not indicated.

NO

YES

Is receiver on
indoor unit exposed
to direct sunlight?

Press RST button
on remote control
with tip of pencil.

NO
YES

YES
Is there any thyristor
fluorescent light
nearby?

NO

NO

YES

Does indoor unit
operate when
moving remote
control near receiver
or indoor unit?

YES

YES

Press START/STOP
button.

Batteries are
exhausted.

NO

Does indoor unit
start to operate by
automatic restart
function?

Is transmission
mark indicated?

NO

YES

YES
NO

Does indoor unit
beep and operate?
YES

Does radio sound is
affected by remote
control when a
signal is transmitted
at distance of 5 cm
from radio?

NO

YES
Remote control is
defective.
P.C. board is
defective.

Avoid direct
sunlight.

Keep indoor unit
away from
thyristor
fluorescent light.

Replace
P.C. board.

Replace
batteries.

36

Normal
operation

Replace remote
control.

Trouble shooting

NO

Trouble

Is the unit display
normal?

YES

Check power supply mains or
interconnection wires

YES

Does outdoor unit run?

YES

NO

Is the power
applied to the unit?

NO

Does the
compressor run
normally?

Is the power normal? check
the voltage between L&N of
terminal block
Check the
compressor ,wires
and it’ s
capacitor.

NO

Check the wiring of indoor and
outdoor

YES
Press the power ON/OFF button
of wire control or remote control

Does the control
ok?

NO

YES
Does the indoor
unit run?

YES

Does the beeper
beep?

Normal

NO
Check the failure code
according to the failure
table

YES
NO

NO

Control failure
YES
Does the control
PCB ok?

Is the display all
off?
YES
Check the connector on display
PCB connected to control PCB
Check the display PCB itself

37

NO
Control PCB failure

Indoor unit and outdoor unit don’ t operate

Indoor and outdoor unit
don’ t operate

Does the electric switch
cut off after a few
nimutes?

Does the electric switch
cut off?

YES

Is the power supply no
problem?

YES
NO

Reconnect the wires.

NO

Change a good remote,
does the air conditioner
running?

Is the insulation of
indoor unit and outdoor
unit no problem?

Press emergency key, does
the air conditioner
running?

Replace remote
control.

YES

Replace remote
receiver or display
panel.

NO
Does the fuse of indoor
PCB burn out?

YES
NO

YES

NO

YES

Rreplace the failure
componet.

Make the power
supply ok.

YES

Is the wires of indoor
unit and outdoor unit no
problem?
YES

Find the reason and
replace the failure
componet.

NO

YES

Replace fuse of
indoor PCB.

NO

Is the resistance of each
main component no
problem?

Does the transformer has
output?

NO
Replace transformer.

YES
Does the 12V and 5V of
indoor PCB have?

YES
normal

38

NO
Replace PCB.

39

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