SiUS331604E Troubleshooting by Error Code
Service Diagnosis 158
4.15 Remote Sensor Abnormality
Error Code C9
Applicable
Models
FXTQ
Method of Error
Detection
The error is detected out by temperature detected by remote sensor.
Error Decision
Conditions
When the remote sensor becomes disconnected or shorted while the unit is running.
Supposed
Causes
Defective indoor unit thermistor (R1T) for air inlet
Defective indoor unit PCB
Troubleshooting
Refer to page 231.
Is the
optional remote
sensor is installed?
Field
setting 10(20)-2 is set at
C3.
Connector is
connected to X16A of
the indoor unit
PCB.
Resistance
is normal when
measured after
disconnecting the sensor
from the indoor unit
PCB.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Set at 03.
Replace the indoor unit PCB.
NO NO
YES
YES
Replace the indoor unit PCB.
Connect the sensor and turn ON
again.
NO
NO
Replace the sensor (R1T).
YES
YES
CHECK 11
CHECK 11
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