Specifications

Troubleshooting for Outdoor Unit SiBE18-821
312 Troubleshooting
7.9 Malfunction of Thermistor for Outdoor Air (R1T)
Remote
Controller
Display
H9
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by the outdoor air thermistor.
Malfunction
Decision
Conditions
When the outside air temperature thermistor has short circuit or open circuit.
Supposed
Causes

Defect of thermistor (R1T) for outdoor air

Defect of outdoor unit PCB (A1P)
Troubleshooting
∗
Refer to “Thermistor Resistance / Temperature Characteristics” table on P349.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Connector is
connected to X11A of
outdoor PC board
(A1P).
Resistance
is normal when
measured after
disconnecting the thermistor
(R1T) from the outdoor
unit PC board.
(3.5kΩ to
360kΩ)
Replace outdoor unit PC
board (A1P).
(Q0558)
Connect the connector
and turn on again.
NO
Replace the thermistor
(R1T).
NO
YES
YES