Troubleshooting for SA Indoor Unit SiBE18-821_C
370 Troubleshooting
5.7 Indoor Heat Exchanger Thermistor (R3T) Abnormality
Remote
Controller
Display
C5
Method of
Malfunction
Detection
The temperature detected by indoor heat exchanger thermistor (R3T)
Malfunction
Decision
Conditions
When the indoor heat exchanger thermistor becomes disconnected or shorted while the indoor
unit is running.
Supposed
Causes
Defective thermistor
Defective indoor unit PCB
Disconnection of connector
Troubleshooting
Refer to “Thermistor Resistance / Temperature Characteristics” table 2 on page 427.
Connect it correctly.
Replace the thermistor
(R3T).
Replace indoor unit
PCB.
NO
NO
YES
YES
(R13005)
Disconnect the thermistor
(R3T) from X17A on the
indoor unit PCB and measure
the resistance.
Is the
thermistor normal?
Is it normal?
Check the connection of
connector
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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