53
Installation and Maintenance
Service Manual
Malfunction indicator of outdoor unit
;7
ZLUH
N
Y
N
Y
N
Y
N
Y
N
Y
Turn on the unit
and wait 1 minute
Use DC voltmeter
to measure the
voltage on the two
ends of electrolytic
capacitor(test 8)
Voltage higher than 200V?
Fault with the voltage
testing circuit on
control panel AP1
Replace the control
panel AP1
Measure the AC voltage between
terminal L and N on wiring board
XT
Voltage within
210VAC~250VAC?
Shut down the power
and repair the power
supply to restore the
range
210VAC~250VAC
power on and
restart the unit
If the fault is
eliminated?
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
Check the
connection of reactor
(L in the Electrical
Wiring Diagram)
If the wiring of
reactor L is normal?
Connect the reactor
L according to Elec-
trical Wiring Diagr-
am correctly
Re-energize and
turn on the unit
If the fault is
eliminated?
End
Replace the control
panel AP1
Outdoor unit
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.
