Error Codes - Haier 2U18MS2VHB Service Manual

The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by
the error code will be the SAME for both indoor and outdoor units even though the numbers may differ.
Indoor Indoor Outdoor
LED5 LED1 LED
2 1
2 2
2 3
2 4
2 5
2 6
2 7
2 8
2 9
3 0
3 1
3 2
3 3
3 4
3 5
3 6
3 7
3 8
3 9
4 0
4 0
4 1
4 1
4 2
4 3
4 4
4 5
4 6
4 7
4 8
4 9
5 0
5 1
5 2
5 3
5 4
5 5
5 6
5 7
5 8
5 9
6 0
6 1
6 2
6 3
6 4
6 5
6 6
0 1
0 2
0 4
0 7
0 8
0 12
0 13
0 14
D-10
Diagnosis
1 Outdoor EEPROM failure
2 IPM overcurrent or short circuit
/ Outdoor alternating current, over current protection
4 Communication failure between the IPM and outdoor PCB
5 Module operated overload (compressor overload protection)
6 Module low or high voltage
/ Compressor current sampling circuit fault
8 Overheat protection for discharge temperature
9 Malfunction of the DC fan motor
10 Malfunction of defrost temperature sensor
11 Suction temperature sensor failure
12 Ambient temperature sensor failure
13 Discharge temperature sensor failure
/ High outdoor suction temperature
15 Communication failure between the indoor & outdoor unit
16 Lack of refrigerant or discharging
17 4-way valve switching failure
18 Loss of synchronism detection
/ Position detection circuit fault of compressor
/ Terminal block temp too high
20 Indoor thermal overload
21 Indoor unit overload protection, heating mode only.
21 Indoor coil frosted
/ Indoor anti-frosting protection
23 Module thermal overload
24 Compressor start failure, over-current
25 Phase current protection (IPM)
26 MCU reset
27 Module current detect circuit malfunction
28 Liquid pipe sensor failure: Circuit A
29 Liquid pipe sensor failure: Circuit B
30 Liquid pipe sensor failure: Circuit C
31 Liquid pipe sensor failure: Circuit D
32 Gas pipe sensor failure: Circuit A
33 Gas pipe sensor failure: Circuit B
34 Gas pipe sensor failure: Circuit C
35 Gas pipe sensor failure: Circuit D
36 Gas pipe sensor failure: Circuit E
/ Outdoor pipe temperature protection in cooling mode
38 Malfunction of module temperature sensor momentary power failure detection
39 Malfunction of condensing temperature sensor
40 Liquid pipe sensor failure: Circuit E
41 Toci temperature sensor failure
42 High Pressure switch open
43 Low Pressure switch open
44 System high pressure protection: Overcharged, high condensing temperature or malfunction of fan motor
45 System low pressure protection: Undercharged, low defrosting temperature, or malfunction of fan motor
/ Incorrect match between indoor & outdoor
/ Indoor ambient temperature sensor failure
/ Indoor coil temperature sensor failure
/ Indoor PCB EEPROM failure
/ Communication fault between the indoor and outdoor unit
/ Communication fault between the controller and Indoor unit
/ Drain system malfunction
/ Zero cross signal detected wrong
/ Indoor fan motor malfunction
COMPACT CASSETTE TECHNICAL OVERVIEW

Error Codes