Gree GWH09UB-K3DNA4F - Page 84

81
Installation and Maintenance
Service Manual
2. IPM protection(H5), desynchronizing malfunction(H7), overcurrent of compressor phase current (P5) (AP1 below means
control board of outdoor unit)
Main detection points:
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H5, H7 or P5 is
displayed after
turning on the unit
Measure if the voltage
input is within 180~265V
with AC voltmeter
(see fig 30)
The compressor
is well connected
with mainboard
AP1?
Heat exchanger is
blocked with dirt?
Clean the heat exchanger
to improve its performance
Restart the unit
Restart the unit
Restart the unit
Restart the unit
The unit starts
operation again
The unit starts
operation again
The unit starts
operation again
The unit starts
operation again
Repair power supply to make
the power voltage normal
Check if system pressure
is too high?
Adjust refrigerant
charging amount
Replace outdoor
mainboard AP1
Replace compressor
Does the unit
work normally
End
Adjust it properly
according to wiring
diagram 5.1
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No