Gree GWH12QB-K3DNC4D - Page 78

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Installation and Maintenance
Service Manual
Outdoor unit:
1. Capacity charging malfunction (outdoor unit malfunction) (AP1 below means control board of outdoor unit)
Main detection points:
●
Detect if the voltage of L and N terminal of XT wiring board is between 210VAC-240VAC by alternating voltage meter;
●
Is reactor (L) well connected? Is connection wire loosened or pulled out? Is reactor (L) damaged?
Malfunction diagnosis process:
N
Y
N
Y
N
Y
N
Y
N
Y
Turn on the unit and
wait 1 minute
Use AC voltmeter to measure
the voltage on the two ends
of electrolytic capacitor
(see fig 30)
Voltage higher
than 200V?
Malfunction of
the outdoor
mainboard AP1
Replace outdoor
mainboard
Measure the voltage
input with AC voltmeter
(see fig 30)
Voltage within
180VAC~260VAC?
Shut down the power and wait 20
minutes; or use DC voltmeter to
measure the voltage on the two
ends of electrolytic capacitor
until the voltage is lower than 20V
Check the connection
of reactor and connection
wire
If the wiring of
reactor L is normal?
Replace outdoor
mainboard AP1
End
Power supply is
abnormal; repair
the power supply
to restore the range
between 180VAC
~260VAC
Power on and
restart the unit
Is the Vmalfunction
eliminated?
Is the Vmalfunction
eliminated?
Connect the
connection
wire of reactor
L correctly
Power on and
restart the unit