Haier HW-07LN03 User manual

Haier air conditioner Edition: 20070925
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Domestic air conditioner
SERVICE MANUAL
zFeature
zFour side air flowing
zPower Failure Compensation
zAuto Right/Left Swing
zTwo cooling/fan/dehumidifying setting
z24 hours ON/OFF
zSliding chassis design
HW-07LN03
Model
HW-12LN03
HW-09LN03

Haier air conditioner Edition: 20070925
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1. Product Code Illumination and Series
introduction
1). Model code rule description
Model identification:
A: Abbreviation of Haier
B: Abbreviation of Window
C: Nominal cooling capacity (BTU/h) with the first two numbers based on one thousand unit.
D: Function code
C - Cooling only
H - Heating pump
E - Electric aided heating
E: Developing sequence
F: The type of power supply
Examples:
HW-07/09/12LN03
It represents window air conditioner. Cooling capacity is 7000/9000/12000 BTU/h and the power
supply is 220V / 50Hz.
2). Standard situation/conditions
Indoor air state outdoor air state
No. Operating condition D.B. ℃W.B. ℃D.B. ℃W.B. ℃
1 Nominal cooling 32 23 43 26
2 Nominal heating / / / /
3 Nominal electrical Heating / / / /
3) Brief introduction of window air conditioner series
1. Temperature set knob can adjust the temperature of the air in room
2. Function set knob can control the fan speed as well as the cooling speed.
3. Vent helps you to exhaust any stale unwanted air in the room and draw fresh outside air in the
room.
HW- □□ □□ □□
A B C D E F

Haier air conditioner Edition: 20070925
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Content
1. Product Code Illumination and Series introduction...........................2
2. Specifications....................................................................................4
3. Main components and accessories' name........................................5
4. Printed Circuit Board Connector Wiring Diagram .............................7
5. Functions and control.......................................................................11
6. Circuit diagram................................................................................13
7. Maintenance.....................................................................................14
8. Trouble shooting ..............................................................................18
9. Installation and repairing...................................................................22
10. Compressor performance diagram..........................................................25

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2. Specification
Item HW-07LN03 HW-09LN03
Cooling capacityW2100 2500
Heating capacityW / /
Power supply 1, 220, 50 1, 220, 50
Power input W980 1000
Running current A 4.6 4.8
Cooling
EER W/W2.65 2.5
Power input W / /
Running current A / /
Heating
COP
Indoor side dB(A) 54/52 54/52
Sound Level Outdoor sidedB(A) 57/5457/54
Net 486x468x352 486x468x352
Dimension Package mm 565x568x447 565x568x447
Net 27 27
Weight Gross 32 32
ManufactureRUICHI RUICHI
Type 44R193AE-AJSC 44R233CF-AJSC
Compressor
Oil Charge ml 260 260
Heating side MPa 2.65 2.65
Pressure Cooling side MPa 0.65 0.65
Model R22
Refrigerant Charge 410 380
Indoor unit Centrifugal fanCentrifugal fan
Type Outdoor unit Axial fan Axial fan
High 1000 1000
Fan
Fan Speed Low920 920
Air volumem3360
Moisture removal 10-3m3/h
Exchanging pipe type/diameter mm / /
Fin material / /
W/W
mm
Kg
Kg
R22
g
r/min
r/min
1.2 1.2
Unit
HW-12LN03
3500
/
1, 220, 50
1250
6.5
2.8
/
/
/
54/52
58/56
560x602x380
595x685x460
33
38
RUICHI
48R313AK-5JSE
260
2.65
0.65
R22
385
Centrifugal fan
Axial fan
890
820
450
/
/
1.2
360
/
/

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3. Main components and accessories' name
Front panel
Air inlet (indoor side)
Air outlet (indoor side)
Control panel
Air inlet (outdoor side)

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1. TEMP. / TIME display
2. TEMP./TIME set
Used to set TIME or TEMP. setting.
3. MODE
Used to select operation mode: FAN, COOL, DEHUM
4. FAN SPEED
Used to select desiredfan speed:LOW or HIGH
5. TIMER
Used for TIMER start or stop.
6. SWING
Used to activate the vertical louver.This will give you an even airflow throughout the room.
7. ENERGY SAVER
This will not only save your electrical and energy costs but also shuts off the unnecessary
8. POWER
Press it to start unit and press it again to stop.
1
2
34
56
7
8
noise of the fan motor running.

4.Printed Circuit Board Connector Wiring Diagram
Connectors Indoor PCB
1)CN2 connector for room temp. sensor.
2)CN3 connector for receiver display.
3)CN8 connector for high fan.
4)CN10 connector for low fan.
5)CN11 connector for fan motor.
6)CN12 connector for louver motor.
7)CN13 connector for louver motor.
8)CN14 connector for power line.
CN2
CN10
CN8
CN14
CN12
CN11
CN13
CN3
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receiver display
5. Functions and control
5.1 Introduction to electrical control functions
Including brief introduction to air conditioners of series models and electric control function.
5.1.1 Cooling run mode:
temperature control range :16℃—30℃
temperature control precision: ±1℃
compressor can’t be controlled by temperature sensor within 2 minutes after it starts.
control character: when Tr ≥Ts, outlet air from compressor is on and indoor fan motor
run at fixed wind speed；When Ts-2 ≤Tr <Ts，outlet air from compressor keep the former
state；When Tr≤Ts-2, outlet air from compressor is off.
Manual operation: When unit is on, the wind speed can be set to high, low as required
(execute instruction 2 seconds later after receiving remote signal)
Compressor control：The compressor can’t be controlled by temperature sensor within
2 minutes after start up and can be only restarted at least 3 minutes later after shutdown.
There is no 3-minute protection with power on for the first time (over 3 minutes with power off).
The compressor must stands by for 3 minutes before it is restarted after shut down.
There is no 2-minute limit when changing the temperature setting or shutting down the
machine through the remote controller, and the machine can be shut down immediately.
Timer on, Timer off control are available.
Energysaver：When set the function, fan and swing will shutdown after compressor off
3 minutes later. This will not only save your electrical and energy costs but also shuts off the
unnecessary noise of the fan motor running.
5.1.2 Dehumidifying mode：
Temperature control range : 16℃—30℃
Control character：
Tr：temperature inside the room；Ts ：the set temperature.
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When Tr>Ts+2℃, the compressor run continuously with indoor fan motor running in
accordance with the wind speed setting.
When Ts-1 ≤Tr ≤Ts + 2 ℃, the compressor will cycle for 10 minutes on and 6 minutes off,
When Tr < Ts-1, the compressor will shut off, and the fan motor runs at low speed.
Timer on, Timer off control are available.
5.1.3 Fan mode：
The temperature set unavailable.
Fan motor running in accordance with the speed setting.
The compressor shut off.
Timer on, Timer off control are available.
5.2 Control function:
5.2.1 Self-checking function: All indicators come on and the nixie tube displays no other than
"8" at the first power-on. The unit turns to the waiting state 3 seconds later.
5.2.2 Timer function:
You can set 24-hour timer on or timer off as required, and the minum time unit is 1 hour.
After setting, the indicator of indoor unit is on , and it is off when timer setting is completed.
There are several timer mode as follows.
⑴Timer on: The LED of “timer on” lights up, and unit behaves with halt status. Timer on
is completed, and then unit starts running with the LED of “timer on” off. The unit starts with
the the last setting receiving timer signals, and sleep setting is not allowed.
⑵Timer off: Unit starts, timer indicator lights up; When reaching time setting, the
indicator goes out, unit enters shut down mode, and sleep function can be set. If timer off and
sleep are set synchronously, the one which time is short run first. Executing shutdown
instruction clear timer and sleep function.
⑶Timer on and timer off can be set only one mode at the same time.
5.2.3 Abnormity Diagnose
1. Sensor diagnose: 2 seconds after the sensors open circuit or short circuit, the unit will
turn off automatically and the LED will show E0 until the sensors resume.
2. Keystroke circuit error diagnose: When power on for the first time, the PCB will check
the keystroke circuit, if the sampling value is different with the theory value, the LED will show
E1, which means failed keystroke circuit. The keyboard is locked and so invalid, but the
remote control is working normally.
5.2.4 Power failure resume(please set and apply as necessary)
If sudden power failure occurs, the unit will resume original operation when power is
supplied again.
Note:
When sudden power failure happens during unit operation in power failure resume mode,
if the air conditioner is not desired for use in a long period, please shut off the power supply in
case that the unit automatically resume operation when power is re-supplied, or press
POWER to turn off the unit when power resumes.
Haier air conditioner Edition: 20070925
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5.3 Value of Thermistor room temperature sensor
R25℃=5KΩ±1%
B25 /50℃℃=3450K±1%
Temp.(℃) Max.(KΩ) Normal(KΩ) Min.(KΩ) Tolerance(℃)
-20 38.5398 37.3992 36.2887 -1.78 1.62
-19 36.5922 35.5274 34.4900 -1.76 1.60
-18 34.7549 33.7607 32.7916 -1.74 1.59
-17 33.0211 32.0927 31.1872 -1.72 1.57
-16 31.3843 30.5172 29.6710 -1.70 1.56
-15 29.8385 29.0286 28.2377 -1.68 1.54
-14 28.3782 27.6216 26.8824 -1.66 1.53
-13 26.9981 26.2913 25.6003 -1.64 1.51
-12 25.6934 25.0330 24.3870 -1.62 1.49
-11 24.4595 23.8424 23.2384 -1.60 1.48
-10 23.2922 22.7155 22.1508 -1.58 1.46
-9 22.1875 21.6486 21.1205 -1.56 1.44
-8 21.1417 20.6380 20.1443 -1.53 1.43
-7 20.1513 19.6806 19.2189 -1.51 1.41
-6 19.2131 18.7732 18.3414 -1.49 1.39
-5 18.3241 17.9129 17.5092 -1.47 1.38
-4 17.4813 17.0970 16.7195 -1.45 1.36
-3 16.6822 16.3230 15.9700 -1.43 1.34
-2 15.9242 15.5886 15.2585 -1.40 1.32
-1 15.2050 14.8913 14.5827 -1.38 1.30
0 14.5224 14.2293 13.9408 -1.36 1.29
1 13.8757 13.6017 13.3320 -1.34 1.27
2 13.2617 13.0057 12.7534 -1.31 1.25
3 12.6786 12.4393 12.2035 -1.29 1.23
4 12.1247 11.9011 11.6806 -1.27 1.21
5 11.5983 11.3894 11.1833 -1.24 1.19
6 11.0979 10.9028 10.7102 -1.22 1.17
7 10.6221 10.4399 10.2599 -1.20 1.15
8 10.1696 9.9995 9.8313 -1.17 1.13
9 9.7390 9.5802 9.4231 -1.15 1.11
10 9.3292 9.1810 9.0343 -1.13 1.09
11 8.9391 8.8008 8.6638 -1.10 1.07
12 8.5676 8.4385 8.3107 -1.08 1.04
13 8.2137 8.0934 7.9740 -1.05 1.02
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14 7.8765 7.7643 7.6530 -1.03 1.00
15 7.5551 7.4506 7.3468 -1.00 0.98
16 7.2487 7.1513 7.0546 -0.98 0.96
17 6.9565 6.8658 6.7757 -0.95 0.94
18 6.6778 6.5934 6.5095 -0.93 0.91
19 6.4118 6.3333 6.2552 -0.90 0.89
20 6.1579 6.0850 6.0124 -0.88 0.87
21 5.9156 5.8479 5.7803 -0.85 0.84
22 5.6841 5.6213 5.5586 -0.83 0.82
23 5.4631 5.4048 5.3466 -0.80 0.80
24 5.2519 5.1978 5.1439 -0.78 0.77
25 5.0500 5.0000 4.9500 -0.78 0.77
26 4.8608 4.8108 4.7609 -0.78 0.78
27 4.6797 4.6298 4.5800 -0.82 0.81
28 4.5064 4.4566 4.4070 -0.86 0.85
29 4.3404 4.2909 4.2415 -0.89 0.88
30 4.1815 4.1323 4.0832 -0.93 0.92
31 4.0293 3.9804 3.9316 -0.97 0.95
32 3.8835 3.8349 3.7865 -1.00 0.99
33 3.7438 3.6955 3.6475 -1.04 1.02
34 3.6098 3.5620 3.5144 -1.08 1.06
35 3.4814 3.4340 3.3869 -1.12 1.09
36 3.3582 3.3113 3.2647 -1.16 1.13
37 3.2401 3.1937 3.1476 -1.20 1.16
38 3.1267 3.0809 3.0353 -1.23 1.20
39 3.0180 2.9727 2.9276 -1.27 1.24
40 2.9136 2.8688 2.8244 -1.31 1.27
41 2.8134 2.7692 2.7253 -1.35 1.31
42 2.7171 2.6735 2.6302 -1.39 1.34
43 2.6247 2.5816 2.5389 -1.43 1.38
44 2.5359 2.4934 2.4513 -1.48 1.42
45 2.4505 2.4087 2.3672 -1.52 1.45
46 2.3685 2.3273 2.2864 -1.56 1.49
47 2.2897 2.2491 2.2088 -1.60 1.53
48 2.2139 2.1739 2.1342 -1.64 1.57
49 2.1410 2.1016 2.0626 -1.68 1.60
50 2.0709 2.0321 1.9937 -1.73 1.64
51 2.0038 1.9656 1.9278 -1.77 1.68
52 1.9391 1.9015 1.8644 -1.81 1.72
53 1.8769 1.8399 1.8033 -1.85 1.76
54 1.8168 1.7804 1.7445 -1.90 1.79
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55 1.7590 1.7232 1.6879 -1.94 1.83
56 1.7032 1.6680 1.6333 -1.99 1.87
57 1.6495 1.6149 1.5808 -2.03 1.91
58 1.5977 1.5636 1.5301 -2.07 1.95
59 1.5477 1.5142 1.4813 -2.12 1.99
60 1.4995 1.4666 1.4343 -2.16 2.03
61 1.4530 1.4206 1.3889 -2.21 2.07
62 1.4081 1.3763 1.3452 -2.25 2.11
63 1.3648 1.3336 1.3030 -2.30 2.15
64 1.3230 1.2923 1.2623 -2.35 2.19
65 1.2827 1.2526 1.2231 -2.39 2.23
66 1.2438 1.2142 1.1852 -2.44 2.27
67 1.2062 1.1771 1.1487 -2.49 2.31
68 1.1699 1.1413 1.1134 -2.53 2.35
69 1.1348 1.1068 1.0794 -2.58 2.39
70 1.1010 1.0734 1.0465 -2.63 2.43
71 1.0682 1.0412 1.0148 -2.68 2.48
72 1.0366 1.0100 0.9842 -2.73 2.52
73 1.0061 0.9800 0.9546 -2.77 2.56
74 0.9765 0.9509 0.9260 -2.82 2.60
75 0.9480 0.9228 0.8984 -2.87 2.64
76 0.9204 0.8957 0.8717 -2.92 2.68
77 0.8937 0.8695 0.8460 -2.97 2.73
78 0.8679 0.8441 0.8211 -3.02 2.77
79 0.8429 0.8196 0.7970 -3.07 2.81
80 0.8188 0.7959 0.7737 -3.12 2.86
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6. CIRCUIT DIAGRAM
Circuit diagram 1
1 2 34
A
B
C
D
4
321
D
C
B
A
R60
510Ω
R59
2.4K
R56
2.4K
R58
2.4K
R57
2.4K
SW7
TSTC-2L（6*6*7）
SW6
TSTC-2L（6*6*7）
SW5
TSTC-2L（6*6*7）
SW4
TSTC-2L（6*6*7）
SW3
TSTC-2L（6*6*7）
R50
330Ω
LED4
Ф
3
-
G
R
E
E
N
LED3
Ф
3
-
G
R
E
E
N
R53
330Ω
R54
330Ω
R49
330Ω
R52
330Ω
+5V
R51
330Ω
R63
1K-0805-±1％
R64
2K-0805-±1％
R65
2K-0805-±1％
R66
2K-0805-±1％
R55
330Ω
R70
10K-0805-±1％
R67
3K-0805-±1％
T E M P / T I M E + S W I N G H E A L T H
T
I
M
E
R
O
F
F
SW2
TSTC-2L（6*6*7）
SW1
TSTC-2L（6*6*7）
R61
1K-0805-±1％
R62
1K-0805-±1％
R69
10K-0805-±1％
F A N C O O L
M O D E S P E E D T I M E R P O W E R
LED6
Ф
3
-
G
R
E
E
N
P2
8550 P3 8550 P4 8550 P5 8550
1 2 3 4
56
7 8 9
10
LED LED8
Ф
3
-
G
R
E
E
N
+5V
LED7
Ф
3
-
G
R
E
E
N
LED5
Ф
3
-
G
R
E
E
N
D E H U M
LED2
Ф
3
-
G
R
E
E
N
LED1
Ф
3
-
G
R
E
E
N
T
I
M
E
R
O
N
R72
10K R73
330Ω
E7
4.7uF-50V
+5V
1
2
3
REV1
HS0038A2m
O U T
V C C
G N Dromte signal receiver
R71
510Ω
GFABCEDH
H I L O W
G
13
RCK
12
SER
14
SRCLR
10
SRCK
11
QA 15
QB 1
QC 2
QD 3
QE 4
QF 5
QG 6
QH 7
QH1 9
IC5
74HC595
R47
51Ω
R45
51Ω
R46
51Ω
C20
0.001uF
C21
0.001uF
C22
0.1uF
C19
0.001uF
+5V
E6
10uF-16V
R48
10K
+5V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CON1
E5
100uF-16V
COM2
595_SER
595_RCK
595_SRCK
COM3
COM4
REC
COM1
SW8
TSTC-2L（6*6*7）
R68
3K-0805-±1％
T E M P / T I M E -
LED9
Ф
3
-
G
R
E
E
N
H
E
A
L
T
H
A
T
U
O
S
W
I
N
G
+5V
C18
0.1uF
KEY
HR-JST-ESA3125-15P250-A1
Circuit diagram 2
1 2 34
A
B
C
D
4
321
D
C
B
A
12
34
K3
12V-5A-892-1AC-C
12
34
K5
12V-5A-892-1AC-C
12
34
K4
12V-5A-892-1AC-C
12
34
K6
12V-25A-891WP-1A-C
C6
0.1uF
+5V
L
CN9
8*14*0.8-Y-D250 CN10 8*14*0.8-Y-D250
R18 1K
R19 1K
R21 1K
R20 1K
R22 1K
R32
2K
R33
220Ω
E4
4.7uF-50V
R8
5.1K-0805-±1％
R5 1K
R7 1K
E3
4.7uF-50V
R6
5.1K-0805-±1％
+5V
BUZZ1
PS1440P02B-T
+5V
1
2
CN2
B2B-XH (White)
1
2
CN1
B2B-XH (Red)
room temp.
pipe temp.
+12V
Compressor
Mid Low
Negative Ion
+12V
+12V
C5
0.1uF
16
15
314
413
512
O6
O7
I2
I3
I5
I6
11
O2
O4
O5
I1
I4
I7
O1
O3
7
6
10
COM
9GND 8
1
2
IC2
2003
(VPP)Mrst
1
(AN0)PA0
2
(AN3)PA3
5
(AN1)PA1
3
(AN2)PA2
4
(T0CKI/AN4)PA4
6
(AN5/SS)PA5
7
VSS
8
OSC1
9
OSC2
10
(T1 CHI)PC0
11
(CCP2)PC1
12
(SCK/SCL)PC3
14 (CCP1)PC2
13
PC4(SDI/SDA) 15
PC5(SDO) 16
PC6(TX/CK) 17
PC7(RX/DT) 18
VSS 19
VDD 20
PB0(INT) 21
PB1 22
PB2 23
PB3 24
PB4 25
PB5 26
PB6 27
PB7 28
IC1 HR6 P7 3 PGS
C4
0.1uF
R4
2.4K
+5V
R1
2K
R3
10K R2
10K
P1
2SA1037AK
C7
0.1uF
C8
0.1uF
XT1
CST8MGW
1
2
3
4
CN4
5267-04A
TXD
RXD
+5V
R31
10K
R30
1K
C11
0.01uF +5V
GND
Net Interface
R28
100Ω
R29
100Ω
C9
100pF
C3
0.1uF
+5V
+5V
C2
0.1uF
E2
470uF-16V
Vin 1
2
Vout
3
IC4 1.5A-7805
C1
0.1uF E1
1000uF-35V
+12V
FUSE1
T3.15A/ 250VAC
L
L
N
RV1
S14K350
C14
0.1uF-275Vac
D2 IN4007
D3 IN4007
D1 IN4007
D4 IN4007
CN11
8*14*0.8-Y-D250
8
844
6
611
T1
220VAC/50Hz/12VAC/400mA
transformer
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CN3
1 2 3
CN5
B2P3-VH
R9
51Ω
R10
51Ω
R11
51Ω
R12
510Ω
R13 2.4K
R14 2.4K
R15 2.4K
R17 2.4K
CN12
4.7*13*0.5-Y-D187
R23 1K
R43
5.1K-0805-±1％
If no use pipe temp.,have the resistance
D7 RLS4148 D8 RLS4148 D9 RLS4148 D10 RLS4148
A0 1
A1 2
A2 3
GND 4 SDA
5SCL
6WP
7VCC
8IC3 AT24C02B
R16
510Ω
R25
560Ω
R26
10K
R27
10K
C10
0.1uF
+5V
12
34
K2
12V-5A-892-1AC-C
CN8
8*14*0.8-Y-D250
High
D6 RLS4148
12
34
K1
12V-5A-892-1AC-C
CN13
4.7*13*0.5-Y-D187
synchro-motor
D5 RLS4148
R24 1K
R36
100Ω-1W -±5％
C12
0.01uF-275Vac
COM2
595_SER
595_RCK
595_SRCK
COM3
COM4
REC
COM1
KEY
CN14
8*14*0.8-Y-D250
B15B-PH
Haier air conditioner Edition: 20070925
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Haier air conditioner Edition: 20070925
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7.Maintenance

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Avoid opening doors and
windows unless necessary. Don't be exposed to cold air
for a long time.
Use curtain or blind
Direct sunlight may reduce
cooling effect, always use
window curtain.
Keep heat source away from
air conditioner.
Set temp. a little bit higher
before going to bed. After unit stops, don't restart it until 3 minutes have elapsed.

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Disposal of the condensed water
Generally there are two methods available on disposal of the condensed water:
1. Block the bottom plate hole of the conditioner with rubber lid, install drain elbows on the back hole
and let the condensing water flow from the back hole of the conditioner. (See Fig.1)
In this method, the accumulated condensed water in the bottom plate is hit by the fan onto the heat
exchanger, and evaporated and blown out from the machine. It can cool the heat exchanger radiator
more quickly, and improve the energy efficiency of the conditioner. But the hitting noise by the fan at the
outdoor side is relatively large.
2. Block the back hole of the conditioner with rubber lid and install drain elbow to the bottom hole, which
can make the condensed water flow out from the bottom plate. (See Fig.2)
This method can reduce the hitting noise by the fan at the outdoor side.
If necessary the above two methods can both have extra pipe added on the drain elbow (available on
the market).
Note:
When install drain elbow, adjust the direction of the drain elbow to make it be in line with
the hole in the rear of unit; Insert the drain tube into hole and twist 90°.
Before cleaning please pull of the power plug. Do not clean the machine with following
material in order to decrease pollution: petrol,
detergent.
Do not pour water on the machine to prevent
electric shock or mechanical trouble.
Hot water above 40℃may cause
discoloration of the shell or deformation.

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Cleaning of the shell and remote controller
Wipe the shell with softcloth. If it is very dirty,please use water with diluted neutral detergent. In wiping,
first twist out the water in the cloth.
Wipe out the detergent onthe machine shell completely.
The horizontal air direction is adjusted
by setting the AUTO SWING ON .
HW-07LN03
HW-09LN03 HW-12LN03
Airflow Direction Vane
The Vertical Airflow Direction Vane is
manually controlled by positioning the
vane todischarge the air upward,
downward or straight out.
Vertical airflow direction
Note:
It is advisable not to keep vertical flap at downward position for a long time
in COOL or FAN mode, otherwise , condensate water might occur.
Don't move the horizontal flap with hand in order to avoid the vertical flap
abnormal, using the remote controller to adjust the move of vertical flap.

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8. Trouble shooting
Before sending to repair, please first check the following:
Phenomenon Reason
Switch on the machine but it
does not work immediately.
If the machine is started after stop, it will need
about 3 minutes to re-start so as to prevent
fuse from break.
Switch on the machine but it
does not work.
1. Is the power on?
2. Is the fuse broken?
3. Is plug firmly inserted?
The cooling effect is not
good.
1. Is the air inlet or outlet entrance blocked?
2. Is there direct sunlight in cooling?
3. Are the doors and windows closed?
4. In cooling are there too many heating
sources?
5. Is the filter too dirty (generally it should be
washed every two weeks)?
Error Codes and Description
Code indication
indoor
Description Reference
Page
E0 Room temperature sensor failureIndoor
Malfunction E1 Keystroke circuit error diagnose

Trouble Shooting
E0: Room temperature sensor failure CN2
E1: Keystroke circuit error diagnose
YES
NO
YES
whether terminal
CN2 on indoor PCB
co
n
tact
w
e
ll?
Pull out the terminals on the indoor
mainboard and reinsert them
Pull the sensor out of the mainboard
1) Measure the value of resistance
Between its two jumpers
2) Measure the temperature at the room
temperature sensing head.
Check the value of
the sensor to see
wh
et
h
e
r
t
h
e
se
n
so
r i
s
NO Sensor is broken,replace it with new sensor
The indoor PCB is broken, replace with
NO
YES
Whether
keystroke indoor
P
C
B
co
n
tact
w
e
ll?
Pull out the terminals on the indoor
mainboard and reinsert them
The indoor PCB is broken, replace with
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10. System flow chart