TROUBLESHOOTING
1-36
“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 alarm code is indicated on the display of the outdoor unit PCB.
This alarm code is indicated when the thermistor is short-circuited (less than 0.2 kΩ) or cut (greater
than 500 kΩ) during running. However, this alarm occurs during test running mode only. In the
case that the thermistor is abnormal during running, operation continues based on the assumption
that the outdoor temperature, is 35°C (Cooling) / 6°C (Heating).
Alarm
Code
Abnormality of Thermistor for Outdoor Air Temperature
(Outdoor Unit Ambient Thermistor)
Yes
Yes
Connect it.
No
Faulty Thermistor
Refer to page 1-30.
Faulty PCB1
No
Is it connected to
THM7 (TA) of PCB1?
Is resistance of THM7
between 0.2kΩ and
500kΩ?
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Faulty Thermistor
for Outdoor Unit
Ambient
Check resistance.
Replace thermistor
if faulty.
Fault
Check wiring to PCB1.
Repair wiring and
connections.
Incorrect Connection
Replace PCB1 and
check operation.
Replace PCB1 if faulty.Faulty PCB1
Outdoor Unit Ambient
Thermistor
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