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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)
Y
The compressor
is well connected
with mainboard
AP1?
Y
Heat exchanger is
blocked with dirt?
N
Check if system pressure
is too high?
N
Replace outdoor
mainboard AP1
N
Repair power supply to make
the power voltage normal
Adjust it properly
N
according to wiring
diagram 5.1
N
Clean the heat exchanger
Y
to improve its performance
N
Adjust refrigerant
Y
charging amount
Does the unit
work normally
N
Replace compressor
Restart the unit
N
Restart the unit
Restart the unit
Restart the unit
Y
The unit starts
Y
operation again
The unit starts
Y
operation again
The unit starts
Y
operation again
The unit starts
Y
operation again
End
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