Si18-201 Troubleshooting - Outdoor Unit Related
Service Diagnosis 299
3.3.34 Faulty Fin Thermistor
Outdoor Unit
Indication
P4
Method of
Malfunction
Detection
Faulty fin thermistor is detected using the temperature detected by the fin.
Malfunction
Decision
Conditions
When the detected temperature came to 120°C or higher, or to -30°C or lower
"
When faulty fin thermistor is detected once, the system shuts down.
(The 1-time counter automatically resets itself when cause of malfunction is resolved.)
Supposed
Causes
"
Faulty sensor provided inside power transistor.
Troubleshooting
Start
Replace sensor provided
inside power transistor.
Reset normally.
Could be outside causes
other than defect.
(MF054)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Turn the power supply off
once and then back on.
Is P4 displayed again?
NO
YES
P4 displayed
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