LG AH-W096A0, Руководство по обслуживанию

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Only for training and service purposes
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Checking Key Components of Indoor Unit
1.2 Water Pump
• 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
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( ) ’ is displayed at control
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 .
(*): It is normal condition that water pump runs or stops during system operation (including compressor start-up)
due to specific control logic.
Start
Water pump
control by
Indoor unit PCB
is not correct
Water pump does
not working
A
B
YES
YES
NO
NO
END
(it is normal
condition)
NO
YES
YES
YES
NO
NO
Water pump always
running while system
operation
Water pump runs
and stops while
compressor start-up
(*)
Water pump always
stop while system
operation
Heating
Operation
DIP Switch No.5
is set to OFF ?
A
B