1-46
TROUBLESHOOTING
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.
This alarm code is indicated when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater
than 840 kΩ) during the cooling operation or heating operation.
Alarm
Code
Abnormality of Thermistor for Indoor Unit Heat Exchanger Liquid
Refrigerant Pipe Temperature (Freeze Protection Thermistor)
Yes
Connect it.
No
Refer to page 1-44 for
thermistor resistance.
Faulty PCB
Is the thermistor connected
to THM3 of PCB?
Yes
Faulty Thermistor
No
Is resistance of THM3
between 0.24 and 840kΩ?
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Faulty Freeze
Protection
Thermistor
Check resistance.
Replace thermistor
if faulty.
Fault
Check wiring to PCB.
Repair wiring and
connections.
Incorrect Connection
Replace PCB and
check operation.
Replace PCB if faulty.Faulty PCB
Freeze Protection
Thermistor (THM3)
In Case of 4-Way Cassette Type
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