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SiUS121827E Troubleshooting for Outdoor Unit
Part 6 Service Diagnosis 227
7.18 Radiation Fin Temperature Rise
Error Code L4
Outdoor Unit LED
Display
A j 1 h 2 h 3 h 4 i 5 h
Method of Error
Detection
A radiation fin temperature rise is detected by checking the radiation fin temperature with the
compressor on.
Error Decision
Conditions
The radiation fin temperature with the compressor on is above A.
The error is cleared when the temperature drops below B.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective outdoor unit PCB
Silicone grease not applied properly on the radiation fin after replacing the outdoor unit PCB
AB
70°C (158°F) 64°C (147.2°F)
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