Water Pump - LG AH-W096A0 Service Manual

1.2 Water Pump

Water pump always
running while system
DIP Switch No.5
is set to OFF ?
Water pump
Indoor unit PCB
is not correct
(*): It is normal condition that water pump runs or stops during system operation (including compressor start-up)
due to specific control logic.
• Water pump does not because of mechanical defects of water pump or wrong wiring at the water pump.
• To correct mechanical defects, contact official After Service Center and replace the water pump.
• To correct wrong wiring, check if wires 'CN_W/PUMP(A)' connector on the indoor unit PCB and
A
water pump terminal box (black plastic box at the water pump) are connected firmly. Also, check
wires are electrically connected by measuring resistance of each wires(if electrically connected
exactly, resistance should be 0 ohm).
• Indoor unit PCB can not make control signal or wrong wiring at the water pump.
• To correct Indoor unit PCB's making control signal, first check the signal level. Use electric voltage
meter and measure voltage at 'CN_W/PUMP(A)' connector on the indoor unit PCB. If measured
value is not 220V ~ 240V AC while 'Water Pump Operating Icon(
B
panel, the indoor unit PCB is in trouble. In this case, contact official After Service Center and
replace the indoor unit PCB.
• To correct wrong wiring, please refer
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Start
(*)
Water pump runs
NO
and stops while
compressor start-up
operation
YES
NO
Heating
Operation
YES
NO
YES
control by
B
Checking Key Components of Indoor Unit
Water pump always
NO
stop while system
YES
END
(it is normal
condition)
.
- 51 -
NO
operation
YES
Water pump does
not working
A
) ' is displayed at control
LGE Internal Use Only