Troubleshooting for Outdoor Unit SiEBE18-526
304 Troubleshooting
7.11 Malfunction of Thermistor (R4T) for Outdoor Unit Heat
Exchanger
Remote
Controller
Display
J6
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by the heat exchanger thermistor.
Malfunction
Decision
Conditions
When a short circuit or an open circuit in the heat exchange thermistor is detected.
Supposed
Causes
Defect of thermistor (R4T) for outdoor unit heat exchanger
Defect of outdoor unit PCB (A1P)
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P326.
(Q0431)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Resistance
is normal when
measured after
disconnecting the thermistor
R4T from the outdoor
unit PCB.
(3.5kΩ~
360kΩ)
Replace outdoor unit PCB A1P.
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor R4T.
YES
YES
Connector
is connected to outdoor
unit PCB
(A1P).
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