SiEBE18-526 Troubleshooting for Outdoor Unit
Troubleshooting 301
7.8 Malfunction of Thermistor for Outdoor Air (R1T)
Remote
Controller
Display
H9
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
The abnormal detection is based on current detected by current sensor.
Malfunction
Decision
Conditions
When the outdoor air temperature sensor has short circuit or open circuit.
Supposed
Causes
Defect of thermistor (R1T) for outdoor air
Defect of outdoor unit PCB (A1P)
Troubleshooting
The alarm indicator is displayed when the fan only is being used also.
∗ Refer to thermistor resistance / temperature characteristics table on P326.
(Q0428)
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
(R1T) from the outdoor
unit PCB.
(3.5kΩ~
360kΩ)
Connector is
connected to outdoor
PCB(A1P).
Replace outdoor unit PCB A1P.
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor (R1T)
YES
YES
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