Service Manual

SiUS091133 Troubleshooting
Service Diagnosis 138
4.25 Radiation Fin Temperature Rise
Remote
Controller
Display
L4
Method of
Malfunction
Detection
A radiation fin temperature rise is detected by checking the radiation fin thermistor with the
compressor on.
Malfunction
Decision
Conditions
 If the radiation fin temperature with the compressor on is above A.
 The error is cleared when the radiation fin 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
 Silicon grease is not applied properly on the radiation fin after replacing the outdoor unit PCB.
AB
09/12 class 98°C (208.4°F) 78°C (172.4°F)
15/18 class 85°C (185°F) 56°C (132.8°F)
24/30/36 class 105°C (221°F) 97°C (206.6°F)