LG Therma V AHBW Series Service Manual page 62

Code
Description
No.
14 Problem in Flow Switch
n Error diagnosis and countermeasure flow chart
Start
NO
System stopped
while operation
YES
NO
Pressure gauge
indicates 150~200 kPa
YES
(*)
NO
Water pump
still running
YES
The flow switch is
electrically open.
C
• Although there is not water flow inside water circuit, the flow switch detects as if water is flowing. It is
due to electrically closed (or short) of flow switch or the contact of flow switch is mechanically stuck.
A
• Contact official After Service Center and replace the flow switch.
• Check the air vent. If there is air in the unit, it can display "CH14". Please remove the air by using the air vent.
• Check if water inside water circuit is fully charged. Pressure gauge at the unit should indicate 150~200 kPa.
• Also, as the hand of the pressure gauge is not react so fast according to water charging, check the pressure gauge again.
B
• 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.
C
• 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.
D
• Also, check the water quality if there are particles that can yield locking at the shaft of the water 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.
• Flow switch is open while in-
ternal water pump is working
• Flow switch is closed while inter-
nal water pump is not working
• Flow switch is open while DIP
switch No. 5 of main
PCB(Heater) is set as ON
(*)
NO
Water pump
running
YES
Water is not enough
or there can be
water leakage inside
water circuit.
B
NO
Control Panel
Shows 'CH14'
YES
(*): How to identify? - Touch the terminal box (black plastic box at
The water pump
the water pump) of water pump and feel if the water pump is vi-
is in trouble.
brating. If no vibration, the water pump is not operating. Also, you
can see 'Water Pump Operating Icon (
D
Cause
• Flow switch should be closed while inter-
nal water pump is working or DIP switch
No. 5 of main PCB(Heater) is set as ON
• Flow switch should be open while in-
ternal water pump is not working
NO
Control Panel
Shows 'CH14'
YES
The flow switch is
electrically closed.
A
END
(it is normal
condition)
- 62 -
Normal Condition
)' at control panel.