Troubleshooting for Outdoor Unit
SiBE121135
298
Service Diagnosis
7.2
Low-voltage Detection or Over-voltage Detection
Remote
Controller
Display
U2
Outdoor Unit LED
Display
A
j
1
i
2
h
3
h
4
i
5
h
Method of
Malfunction
Detection
Indoor Unit
The zero-cross detection of the power supply is evaluated by the indoor unit PCB.
Outdoor Unit
Low-voltage detection:
An abnormal voltage drop is detected by the DC voltage detection circuit.
Over-voltage detection:
An abnormal voltage rise is detected by the over-voltage detection circuit.
Malfunction
Decision
Conditions
Indoor Unit
There is no zero-cross detection in approximately 10 seconds.
Outdoor Unit
Low-voltage detection:
The voltage detected by the DC voltage detection circuit is below 150 V for 0.1 second.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Over-voltage detection:
An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer.
The compressor stops if the error occurs, and restarts automatically after 3-minute standby.
Supposed
Causes
Supply voltage is not as specified.
Defective DC voltage detection circuit
Defective over-voltage detection circuit
Defective PAM control part
Disconnection of compressor harness
Noise
Momentary fall of voltage
Momentary power failure
Defective indoor unit PCB
