Troubleshooting for Outdoor Unit SiBE18-821_C
408 Troubleshooting
7.23 Radiation Fin Thermistor Abnormality
Remote
Controller
Display
P4
Method of
Malfunction
Detection
Resistance of radiation fin thermistor is detected when the compressor is not operating.
Malfunction
Decision
Conditions
When the resistance value of thermistor becomes a value equivalent to open or short circuited
status
★
Malfunction is not decided while the unit operation is continued.
"
P4
" is displayed by pressing the inspection button.
Supposed
Causes
Defective radiation fin thermistor
Defective main PCB (A1P)
Troubleshooting
Disconnect the lead wires
from the compressor, and
then check the compressor
for the insulation resistance.
Remove and insert the
connector for the fin
thermistor [X111A].
Turn
ON the power
supply, and then check
whether or not the
malfunction
recurs.
The
insulation
resistance is low. (not
more than 100 kΩ)
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Completed.
(R13041)
Replace the compressor.
YES
Replace the main PCB
(A1P).
YES
NO
NO
Power OFF
Power ON
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