Hitachi RPI-0.8FSG1 Service Manual page 64

TROUBLESHOOTING
Alarm
Code
G "RUN" light flickers and "ALARM" is indicated on the remote control switch.
G 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.
THM10
RAS-5FSG, 5FS3
RAS-8FSG, 8FS3
RAS-10FSG, 10FS3
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?
Faulty PCB1
Phenomenon
Faulty Thermistor
for Evaporating
Temperature
during Heating
1-54
Abnormality of Thermistor for Evaporating Temperature
during Heating Operation (Outdoor Unit)
THM10
THM11
RAS-16FSG, 16FS3
RAS-20FSG, 20FS3
No
Yes
No
Regarding the thermistor characteristics,
Yes
refer to page 1-44.
Cause
Fault
Incorrect Connection
Faulty PCB
THM11
THM10
RAS-8FXG, 8FX3
RAS-10FXG, 10FX3
Connect it.
Faulty Thermistor
Check Item
Check resistance.
Check wiring to PCB.
Replace PCB and
check operation.
THM10
THM11
RAS-24FSG1, 24FS5
30FSG1, 30FS5
(*1) Indication on the display
of the outdoor unit PCB.
1 2 4 Faulty Te1
2 2 4 Faulty Te2
3 2 4 Faulty Te3
Action
(Turn OFF Main Switch)
Replace thermistor
if faulty.
Repair wiring and
connections.
Replace PCB if faulty.
THM5