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SiUS091133 Troubleshooting
Service Diagnosis 136
4.24 Electrical Box Temperature Rise
Remote
Controller
Display
L3
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 A.
The error is cleared when the radiation fin temperature drops below B.
To cool the electrical components, the outdoor fan starts when the radiation fin temperature
rises above C and stops when it drops below B.
Supposed
Causes
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective outdoor unit PCB
ABC
09/12 class 98°C (208.4°F) 75°C (167°F) 83°C (181.4°F)
15/18 class 122°C (251.6°F) 64°C (147.2°F) 113°C (235.4°F)
24/30/36 class 100°C (212°F) 70°C (158°F) 85°C (185°F)
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