SiBE31-801_C Troubleshooting by Indication on the Remote Controller
Troubleshooting 240
4.11 “
C9
” Indoor Unit: Malfunction of Thermistor (R1T) for
Suction Air
Remote
Controller
Display
C9
Applicable
Models
All indoor unit models
Method of
Malfunction
Detection
Malfunction detection is carried out by temperature detected by suction air temperature
thermistor.
Malfunction
Decision
Conditions
When the suction air temperature thermistor becomes disconnected or shorted while the unit is
running.
Supposed
Causes
Defect of indoor unit thermistor (R1T) for suction air
Defect of indoor unit PCB
Troubleshooting
∗
Refer to “Thermistor Resistance / Temperature Characteristics” table on P.408.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
NO
Normal (The malfunction is caused
by faulty contact.)
YES
YES
NO
Remove the thermistor from
the indoor unit PCB, and then
insert it again.
Replace the thermistor (R1T).
Replace the indoor unit PCB.
Remove the thermistor from the
indoor unit PCB, and then make
resistance measurement of the
thermistor using a multiple
meter.
Is the thermistor
normal?
*
5 kΩ to 90 kΩ
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