Gree GWH12UB-K3DNA4F Service Manual page 63

Outdoor Unit
09K/12K
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?
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)
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
60
Voltage higher
Yes
than 200V?
No
No
Yes
Connect the
connection
No
wire of reactor
L correctly
Yes
End
Malfunction of
Replace outdoor
the outdoor
mainboard
mainboard AP1
Power supply is
abnormal; repair
the power supply
Power on and
to restore the range
restart the unit
between 180VAC
~260VAC
Power on and
restart the unit
Is the Vmalfunction
eliminated?
No
Is the Vmalfunction
eliminated?
No
Installation and Maintenance
Service Manual
Yes
Yes