Gree GWH12UB-K3DNA4F Service Manual page 72

Service Manual
2. Capacity charging malfunction (outdoor unit malfunction) (AP1 below is control board of outdoor unit)
Main detection point:
● Detect if the voltage of L and N terminal of wiring board is between 210AC-240AC by alternating voltage meter;
● Is reactor (L) well connected? Is connection wire loosened or pull-out? Is reactor (L) damaged?
Malfunction diagnosis process:
Measure the AC voltage between
terminal L and N on wiring board
XT(power supply)
Shut down the power and wait 20 mi
use DC voltmeter to measure the voltage
on the two ends of capacitor (test3), until
the voltage is lower than 20V
Installation and Maintenance
Turn on the unit
and wait 1 minute
Use DC voltmeter
to measure the
voltage on the two
ends of electrolytic
capacitor
Voltage higher than 200V? Yes
Y
No
N
Voltage within
No
N
210VAC~250VAC?
Yes
Y
nutes; or
Check the
connection of reactor
(L in the Electrical
Wiring Diagram)
If the wiring of
No
N
reactor L is normal?
Yes
Y
Replace the control
panel AP1
End
Fault with the voltage
Replace the control
testing circuit on
panel AP1
control panel AP1
Shut down the power
and repair the power power on and
supply to restore the restart the unit
range
210VAC~250VAC
No
Connect the reactor
Laccording to Elec-
Re-energize and
trical Wiring Diagr-
turn on the unit
am correctly
No N
If the fault is
eliminated?
N
If the fault is
eliminated?
Yes
Y
Yes
Y
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