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Compressor Motor Desynchronizing; Compressor Startup Failure; Input Overcurrent Of The Drive Module - 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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[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
Flow Charts
Topic Title
Is supply voltage normal?
between power module
and compressor correct?
Is power module is normal?
Is compressor normal
(compressor coil resistor,
Compressor load is too
high, find the reason
Is supply voltage normal?
Is wiring between power
module and compressor
Is power module is
Is compressor is normal
(compressor coil resistor,
insulation)?
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
TROUBLESHOOTING & REFERENCES
No
Yes
Is wire connection
No
Yes
No
Yes
No
insulation)?
Yes
No
Yes
No
correct?
Yes
No
normal?
Yes
No
No
Yes
No
Yes
No
Yes
Correct power supply
Correct the wiring
according to diagram
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
J-25

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