SiBE18-821_C Troubleshooting for Outdoor Unit
Troubleshooting 397
7.12 Outdoor Heat Exchanger Thermistor (R4T) Abnormality
Remote
Controller
Display
J6
Method of
Malfunction
Detection
The temperature detected by the outdoor heat exchanger thermistor determines the error.
Malfunction
Decision
Conditions
When a short circuit or an open circuit in the outdoor heat exchanger thermistor is detected
Supposed
Causes
Disconnection of thermistor
Defective outdoor heat exchanger thermistor (R4T)
Defective main PCB (A1P)
Troubleshooting
Refer to “Thermistor Rsistance / Temperature Characteristics” table 2 on page 427.
Is the thermistor
ASSY connected to
X12A on the main
PCB (A1P).
Is the
resistance
normal when
measured after
disconnecting the
thermistor (R4T)?
(3.5 kΩ~ 360 kΩ)
Replace the main PCB
(A1P).
(R13028)
Connect the thermistor and
turn on again.
NO
Replace the outdoor heat
exchanger thermistor
(R4T).
NO
YES
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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