Troubleshooting Si12-411A
196 Service Diagnosis
5.20 Electrical Box Temperature Rise
Remote
Controller
Display
L3
Outdoor Unit LED
Display
A
5
1
4
2
4
3
1
4
4
Method of
Malfunction
Detection
An electrical box temperature rise is detected by checking the radiation fin thermistor with the
compressor off.
Malfunction
Decision
Conditions
With the compressor off, the radiation fin temperature is above 80°C (above 75°C in the case of
8.0 · 9.0kW class). (Reset is made when the temperature drops below 70°C.)
Supposed
Causes
Fin temperature rise due to defective outdoor unit fan
Fin temperature rise due to short-circuit
Fin thermistor defective
Connector in poor contact
Outdoor unit PCB defective
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