Gree GWH18YD-K6DNA2A Service Manual page 55

Confirm the malfunction type according to indoor or outdoor malfunction indicator and malfunction sheet (usually it is stuck on the
electric box cover or the top cover of the unit). The indicators of outdoor control board will directly display the corresponding malfunction
if there is a malfunction; Some malfunctions are displayed directly on the indoor displayer and some malfunctions can be viewed only
by remote controller (by pressing light button for four times within 3s) In the below malfunction chart, "Y" means "Yes"; "N" means "No";
control board AP1 means outdoor control board.
Before malfunction check, discharge the electrolytic capacitor according to the mentioned method and make sure the voltage is below
20V. Otherwise, it may cause electric shock or broking the control board.
Outdoor unit
Malfunction indicator of outdoor unit
Measure the AC voltage between
terminal L and N on wiring board
XT
Shut down the power and wait 20 minutes;
or use DC voltmeter to measure the voltage
on the two ends of capacitor , until the
voltage is lower than 20V
52
Turn on the unit
and wait 1 minute
Use DC voltmeter
to measure the
voltage on the two
ends of electrolytic
capacitor(test 8)
Fault with the voltage
testing circuit on
Y
Voltage higher than 200V?
control panel AP1
N
Shut down the power
and repair the power
Voltage within
N
supply to restore the
210VAC~250VAC?
range
210VAC~250VAC
Y
Check the
connection of reactor
(L in the Electrical
Wiring Diagram)
Connect the reactor
L according to Elec-
If the wiring of
N
reactor L is normal? trical Wiring Diagr-
am correctly
Y
Replace the control
panel AP1
End
Replace the control
panel AP1
power on and
If the fault is
Y
restart the unit
eliminated?
N
Re-energize and If the fault is
Y
turn on the unit eliminated?
N
Service Manual
Installation and Maintenance