MCAC-UTSM-2008-05 Troubleshooting
Outdoor Units 49
1. Running lamp flash at 5Hz: Room temperature sensor is abnormal
2. Defrosting lamp flash at 5Hz: Evaporator temperature sensor is abnormal
Running lamp flash at 5Hz
Judge: Room temperature sensor is abnormal
Validate: Check whether the resistance of the
temperature sensor is correct according to
Replace room temperature sensor
No
Replace indoor PCB
Yes
Defrosting lamp flash at 5Hz
Judge: Evaporator temperature sensor is abnormal
Validate: Check whether the resistance of the
temperature sensor is correct according to Annex 1
Replace room temperature sensor
No
Replace indoor PCB
Yes
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