Troubleshooting for Outdoor Unit SiBE18-821_C
394 Troubleshooting
7.9 Outdoor Temperature Thermistor (R1T) Abnormality
Remote
Controller
Display
H9
Method of
Malfunction
Detection
The temperature detected by the outdoor temperature thermistor determines the error.
Malfunction
Decision
Conditions
When the outdoor temperature thermistor has short circuit or open circuit
Supposed
Causes
Disconnection of thermistor
Defective outdoor temperature thermistor (R1T)
Defective main PCB (A1P)
Troubleshooting
Refer to “Thermistor Resistance / Temperature Characteristics” table 2 on page 427.
Is the
thermistor
connected to X11A on
the main PCB
(A1P)?
Is the
resistance
normal when
measured after
disconnecting the
thermistor (R1T)?
(3.5 kΩ to
360 kΩ)
Replace the main PCB
(A1P).
(R13025)
Connect the thermistor and
turn on again.
NO
Replace the outdoor
temperature thermistor
(R1T).
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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