Haier GE 2U18MS2HDA Service Manual page 31

[18] Compressor motor desynchronizing
Motor desynchronizing occurred. Caused by overload,
load sharply fluctuating, abnormal compressor current
sensor circuit, or one of the inverter gate drive signals is
missing.
Possible causes:
• The power supply is abnormal
• Incorrect compressor wiring
• The power module is bad
• The compressor is bad
• The system is overload
[24] Compressor startup failure
Compressor start failure has been detected by driver
module.
Possible causes:
• The power supply is abnormal
• Incorrect compressor wiring
• The power module is bad
• The compressor is bad
• System overload
[25] Input overcurrent of the drive module
Compressor drive module input current higher
than 32A (double fan model), or 27A (single fan).
Locks if it occurs 3 times in 1 hour.
Possible causes:
• Incorrect compressor wiring
• The power module is bad
• The compressor is bad
Troubleshooting
Is supply voltage normal?
between power module
and compressor correct?
Is power module is normal?
(compressor coil resistor,
Compressor load is too
Is supply voltage normal?
Is wiring between power
module and compressor
Is power module normal?
Is compressor normal
(compressor coil resistor,
Compressor load too
high, find the reason
Is electric box and compressor
wiring correct and firmly in place?
Is compressor normal
(compressor coil resistor,
insulation)?
Is power module is normal?
Solve or correct any
failures according to
relative information
ERROR CODES & TROUBLESHOOTING
No
Yes
Is wire connection
No
Yes
Yes
Is compressor normal
No
insulation)?
Yes
high, find the reason
No
Yes
No
correct?
Yes
No
Yes
No
insulation)?
No
Yes
No
Yes
No
Yes
Correct power supply
Correct the wiring
according to diagram
No
Replace power
module
Replace
compressor
Correct power supply
Correct the wiring according
to diagram
Replace power
module
Replace
compressor
Correct the wiring according
to diagram
Replace
compressor
Replace power
module
PAGE 31