Water Pump - LG ZHBW041GA0 Service Manual

1.2 Water Pump

Water pump always
running while system
Water pump
control by 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 operate because of mechanical malfunction of water pump or wrong wiring at
the water pump.
• To correct mechanical defects, contact a licensed professional.
A
• To correct wrong wiring, check if wires 'CN_MOTOR1' connector on the unit PCB and water pump
terminal box (black plastic box at the water pump) are connected firmly. Also, check wires are elec-
trically connected by measuring resistance of each wires (if electrically connected exactly, resis-
tance should be 0 ohm).
• Unit PCB can not make control signal or wrong wiring at the water pump.
• To correct unit PCB's making control signal, first check the signal level. Use electric voltage meter
and measure voltage at 'CN_MOTOR1' connector on the unit PCB. If measured value is not
220-240 V~ while 'Water Pump Operating' is displayed at control panel, the unit PCB is in trouble.
B
In this case, contact official After Service Center and replace the unit PCB.
• To correct wrong wiring, please refer Ⓐ.
Start
NO
compressor start-up
operation
YES
NO
Heating
Operation
YES
B
*Water pump runs
NO
and stops while
YES
END
(it is normal
condition)
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NO
Water pump always
stop while system
operation
YES
Water pump does
not working
A