Checking Key Components Of Indoor Unit; Checking Key Components Of Unit; Flow Switch - LG ZHBW041GA0 Service Manual

1. Checking Key Components of Unit

1.1 Flow Sensor
Start
System stopped
while operation
Pressure gauge
indicates 1.5~2.0 bar
(*)
Water pump
still running
The flow switch is
electrically open.
* : How to identify? - Touch the terminal box (black plastic box at the water pump) of water pump and feel if the
water pump is vibrating. If no vibration, the water pump is not operating. Also, you can see 'Water Pump
Operating' at control panel.
• Check if water inside water circuit is fully charged. Pressure gauge at the unit should indicate
1.5~2.0 bar(21.8 ~ 29.0 PSI).
• Also, as the hand of the pressure gauge is not react so fast according to water charging, check the
A
pressure gauge again.
• Otherwise, there can be water leakage inside water circuit. Examine if water circuit is completely
sealed.
• Although water is well flowing, the flow switch can not detect water flow. It is due to electrically open
of flow switch or the contact of flow switch is mechanically broken.
B
• Contact official After Service Center and replace the flow switch.
• Read 'Checking Key Components of Unit – Water Pump' carefully to get more detail information.
• Contact official After Service Center and replace the water pump.
• Also, check the water quality if there are particles that can yield locking at the shaft of the water
C
pump.
• Check the air vent. If there is air in the unit, it can display "CH14". Please remove the air by using
the air vent.
Water is not enough
NO
or there can be
water leakage inside
YES
NO
Control Panel
Shows 'CH14'
YES
The water pump
is in trouble.
B
water circuit.
A
NO
YES
C
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END
(it is normal
condition)