Gree GWH12MB-K3DNE3G Service Manual page 46

Service Manual
6.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?
Use AC voltmeter to measure
the voltage on the two ends
of electrolytic capacitor
(see fig 30)
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
Installation and Maintenance
Turn on the unit and
wait 1 minute
Voltage higher
Y
than 200V?
N
Measure the voltage
input with AC voltmeter
(see fig 30)
Voltage within
N
180VAC~260VAC?
Y
If the wiring of
N
reactor L is normal?
Y
Replace outdoor
mainboard AP1
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
Connect the
connection Power on and
wire of reactor restart the unit
L correctly
N
Is the Vmalfunction
eliminated?
N
Is the Vmalfunction
eliminated?
Y
Y
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