Haier 3U19FS1ERA Manuel D'installation page 17

Trouble shooting
Malfunction
Diagnosis
Code
Faulty of outdoor unit EEPROM Communication failure
1
between Module and ECU
Communication cables broken or not well connected.IPM
2
overcurrent or short circuit
Communication failure between Module and ECU
4
Communication cables broken or not well connected.
5 Module operated overload
Module low or high DC voltage (under 192V or above
6
375V)
Discharging temperature overheating.Lack of refrigerant,
8
ambient temperature too high or PMVs blocked.
9 Malfunction of the DC fan motor
10 Malfunction of defrosting temp. sensor(Te)
11 Malfunction of compressor suction temp. sensor (Ts)
12 Malfunction of ambient temp. sensor(Ta)
13 Malfunction of compressor discharge temp. sensor (Td)
15 Communication failure between indoor&outdoor unit
17 4-way valve switching failure
18 Module overcurrent / Module switch failure
20 Indoor overload
21 Indoor frosted
23 Module temperature too high (Overload Protecter)
24 Compressor overcurrent
25 Input overcurrent
26 MCU reset
27 Module current detect circuit malfunction
28 Malfunction of liquid pipe temp. sensor for indoor unit A
29 Malfunction of liquid pipe temp. sensor for indoor unit B
30 Malfunction of liquid pipe temp. sensor for indoor unit C
31 Malfunction of liquid pipe temp. sensor for indoor unit D
32 Malfunction of gas pipe temp. sensor for indoor unit A
33 Malfunction of gas pipe temp. sensor for indoor unit B
34 Malfunction of gas pipe temp. sensor for indoor unit C
35 Malfunction of gas pipe temp. sensor for indoor unit D
36 Malfunction of gas pipe temp. sensor for indoor unit E
39 Malfunction of condensing temp. sensor(TC)
40 Malfunction of liquid pipe temp. sensor for indoor unit E
41 Malfunction of piping temp. sensor(TOCI)
42 System high pressure switch off
43 System low pressure switch off
System high pressure protection.Refrigerant
44 overabundance,High condensing temp. or malfunction of
fan motor.
System low pressure protection.Refrigerant shortage,Low
45
defrosting temp., or malfunction of fan motor.
46 Malfunction of module temp.sensor
Possible reasons
Faulty of outdoor unit EEPROM
IPM on the module overcurrent,or short circuit
Communication cables broken,or not be well connected,or faulty main
ECU,or faulty module
Module worked overload
VDC 192V or VDC 375V
Discharging temperature overheating.Lack of refrigerant,ambient
temperature too high or PMVs blocked.
Fan is blocked,or the terminal is disconnected from the ECU
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Wrong connection,or the wires be disconnected,or faulty ECU,or faulty
power supply
Coil of 4-way valve is disconnected,or faulty outdoor ECU
Module switch failure,or faulty module
Indoor overload
Indoor frosted
Module temperature too high,or the temperature sensor broken(detected
by the ECU)
Over current of the compressor,or malfunction of the module
Over current of the system,or malfunction with indoor or outdoor fan
motors,or faulty ECU
MCU on the ECU reset
Current detect circuit broken,or faulty module
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
Sensor disconnected,or broken,or at wrong position or short circuit
High pressure switch is disconnected,or high pressure switch is broken,or
high pressure switch worked
Low pressure switch is disconnected,or low pressure switch is broken,or
low pressure switch worked
Tc too high and faulty outdoor fan motors when cooling,or faulty indoor
fan motor when heating,or refrigerant overabundance.
Te too low and faulty outdoor fan motors when heating,or faulty indoor
fan motor when cooling,or refrigerant shortage.
Sensor disconnected,or broken,or at wrong position or short circuit
15