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TROUBLESHOOTING & REFERENCES
J-25
ENGLISH
Topic TitleFlow Charts
Correct power supply
Is supply voltage normal?
Is wire connection
between power module
and compressor correct?
Is power module is normal?
Correct the wiring
according to diagram
Replace power
module
Ye s
Ye s
Ye s
No
No
No
Is compressor normal
(compressor coil resistor,
insulation)?
Replace
compressor
Ye s
No
Compressor load is too
high, find the reason
[18] Compressor motor desynchronizing
Motor desynchronizing occurred. Caused by overload, load
sharply uctuating, 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
Correct power supply
Is supply voltage normal?
Is wiring between power
module and compressor
correct?
Is power module is
normal?
Correct the wiring according
to diagram
Replace power
module
Ye s
Ye s
No
No
Compressor load too
high, find the reason
Ye s
Is compressor is normal
(compressor coil resistor,
insulation)?
No
Replace
compressor
No
[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
Correct the wiring according
to diagram
Is electric box and compressor
wiring correct and firmly in place?
Is compressor normal
(compressor coil resistor,
insulation)?
Is power module is normal?
Replace
compressor
Replace power
module
Ye s
Ye s
Ye s
No
No
No
[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
Solve or correct any
failures according to
relative information
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