Trouble Shooting
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Only for training and service purposes
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14 Problem in Flow Switch
Code
No.
Description Cause Normal Condition
•
Flow switch is open while
internal 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 indoor unit PCB is
set as ON
•
Flow switch should be closed while inter-
nal water pump is working or DIP switch
No. 5 of indoor unit PCB is set as ON
• Flow switch should be open while
internal water pump is not working
■ Error diagnosis and countermeasure flow chart
Start
The flow switch is
electrically open.
END
(it is normal
condition)
The water pump
is in trouble.
Water is not enough
or there can be
water leakage inside
water circuit.
The flow switch is
electrically closed.
A
B
C D
NO
YES
YES
YES
YES
YES
NO NO
NO
NO
YES
NO
System stopped
while operation
Pressure gage
indicates 1.5~2.0 bar
Water pump
still running
(*)
Water pump
running
(*)
Control Panel
Shows ‘CH14’
Control Panel
Shows ‘CH14’
(*): 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 Icon( ) ’ at control panel.
• 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.
• Contact official After Service Center and replace the flow switch.
• Check if water inside water circuit is fully charged. Pressure gage at the indoor unit should indicate 1.5~2.0 bar.
•
Also, as the hand of the pressure gage is not react so fast according to water charging, check the pressure gage 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.
• Contact official After Service Center and replace the flow switch.
• Read ‘Checking Key Components of Indoor 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 pump.
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