1-54
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 or the unit No. and alarm code are indicated on the display of the outdoor unit PCB. (*1)
If abnormality with the thermistor is found, check all the thermistors as shown below.
The evaporating thermistor during the heating operation is attached to the heat exchanger as shown
below figure.
If this thermistor is faulty, this alarm is indicated. The position is indicated below.
Alarm
Code
Abnormality of Thermistor for Evaporating Temperature
during Heating Operation (Outdoor Unit)
Yes
Yes
Connect it.
No
Faulty Thermistor
Regarding the thermistor characteristics,
refer to page 1-44.
Faulty PCB1
No
Is CN105 or CN106
on PCB1 connected
to THM10 (Te1), or
THM11 (Te2) or
THM15 (Te3)?
Is resistance of the
thermistor between
0.2kΩ and 500kΩ?
(*1) Indication on the display
of the outdoor unit PCB.
124Faulty Te1
224Faulty Te2
324Faulty Te3
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 PCB.
Repair wiring and
connections.
Incorrect Connection
Replace PCB and
check operation.
Replace PCB if faulty.Faulty PCB
RAS-5FSG, 5FS3
RAS-8FSG, 8FS3
RAS-10FSG, 10FS3
RAS-8FXG, 8FX3
RAS-10FXG, 10FX3
RAS-16FSG, 16FS3
RAS-20FSG, 20FS3
THM10
THM11
THM10
RAS-24FSG1, 24FS5
30FSG1, 30FS5
THM10
THM11
THM11
THM5
THM10
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