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Error Codes - Haier 2U18MS2VHB Service Manual

Ductless multi-split heat pump, outdoor/indoor, wall mount - highwall, 2'x2' compact cassette, 3'x3' large cassette, slim duct, mid-static ducted, medium static ducted, console
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Table of Contents
LED Error
Diagnosis
Code
1
Outdoor EEPROM failure
2
IPM overcurrent or short circuit
4
Communication failure between the IPM and outdoor PCB
5
Module operated overload (compressor overload protection)
6
Module low or high voltage
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
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
20
Indoor thermal overload
21
Indoor unit overload protection, heating mode only.
21
Indoor coil frosted
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
Malfunction of module temperature sensor momentary power failure
38
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
System high pressure protection: Overcharged, high condensing
44
temperature or malfunction of fan motor.
System low pressure protection: Undercharged, low defrosting
45
temperature, or malfunction of fan motor.

Error Codes

OUTDOOR TECHNICAL OVERVIEW
Precautions For Adding Refrigerant
1. This system must use refrigerant R410A.
2. Add refrigerant 0.20 oz/ft per meter
when the total piping length exceeds the
standard value.
3. The total liquid piping length must be less
than the max value.
Outdoor Unit
Std. Value
2U18MS2VHB
15m/50ft.
3U24MS2VHB
23m/75ft.
4U36MS2VHB 30m/100ft. 70m/230ft.
Notes:
1. No addressing is necessary. All indoor wiring
connections must match the outdoor connections, or
a communication failure will result.
2. Set SW5-8 to ON for Quiet Operation if desired.
Maximum capacity may be slightly reduced.
3. Do not change any switch settings unless directed to
do so.
* PCB: Printed Circuit Board
* IPM: Inverter Power Module
* EEV: Electronic Expansion Valve
Max Value
30m/100ft.
60m/197ft.
B-23

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