TROUBLESHOOTING
1-37
“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.
If abnormality with the thermistor is found, check all the thermistors as shown below.
This alarm code is indicated when the thermistor is short-circuited (less than 0.2 kΩ) or cut (greater
than 500 kΩ) during operation.
The evaporating thermistor during the heating operation is attached to the heat exchanger as shown
below figure.
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Faulty Thermistor
for Evaporating
Temperature
during Heating
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
Alarm
Code
Abnormality of Thermistor for Evaporating Temperature
during Heating Operation (Outdoor Unit Evaporating Thermistor)
Yes
Yes
Connect it.
No
Faulty Thermistor
Regarding the thermistor characteristics,
refer to page 1-30.
Faulty PCB1
No
Is it connected to
THM8 (Te) of PCB1?
Is resistance of the
thermistor between
0.2kΩ and 500kΩ?
(Evaporating
Temperature
for Outdoor Unit)
Thermistor
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