Troubleshooting by Indication on the Remote Controller
SiUS30-1301
176
Service Diagnosis
3.14 Thermistor Abnormality
Error Code
CA
Applicable
Models
FXMQ07~48P
Method of Error
Detection
The error is detected by temperature detected by thermistor.
Error Decision
Conditions
When the thermistor becomes disconnected or shorted while the unit is running.
Supposed
Causes
Defective connector connection
Defective thermistor
Defective indoor unit PCB
Troubleshooting
Note:
1. Error code and thermistor
Refer to P.250.
Is the
thermistor normal?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
5 k
Ω
to 90 k
Ω
Remove the thermistor from
the indoor unit PCB, and
then insert it again.
Remove the thermistor from
the indoor unit PCB, and then
make resistance measurement
of the thermistor using a
multiple meter.
Normal (The error is caused by
defective contact.)
YES
NO
Replace the indoor unit PCB.
YES
Replace the thermistor (
∗
1).
NO
CHECK 11
Error code
Thermistor
Electric symbol
CA
Discharge air thermistor
R4T
CHECK 11