SiBE121021_C Troubleshooting for Outdoor Unit
Service Diagnosis 359
7.17 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
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
Low-voltage detection:
îš„
The voltage detected by the DC voltage detection circuit is below 150 V for 0.1 second.
îš„
If the error repeats 16 times, the system is shut down.
îš„
Reset condition: Continuous run for about 60 minutes without any other error
Over-voltage detection:
îš„
An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer.
îš„
The compressor stops if the error occurs, and restarts automatically after 3-minute standby.
Supposed
Causes
îš„
Supply voltage is not as specified.
îš„
Defective DC voltage detection circuit
îš„
Defective over-voltage detection circuit
îš„
Defective PAM control part
Troubleshooting
Correct the power supply.
Replace the outdoor unit
PCB.
Check for such factors for a
long term.
∗ Try to restart a few times.
(R7150)
Caution
NO
YES
YES
NO
YES
NO
Replace the fan motor or
the outdoor unit PCB.
Repeat a few
times.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check the supply voltage.
Rotate the fan by hand.
(Precaution before turning on the power again)
Make sure the power has been off for
at least 30 seconds.
Disturbance factors
∗ Noise ∗ Power supply distortion
Supply voltage as
specified?
Does the fan rotate
smoothly?
Turn on the power
again. System
restarted?
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