SiUS04-904 Troubleshooting
142 Service Diagnosis
4.22 Over-voltage Detection
Remote
Controller
Display
U2
Method of
Malfunction
Detection
An abnormal voltage rise is detected by checking the specified over-voltage detection circuit.
Malfunction
Decision
Conditions
An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer (The
voltage is over 400V).
The system is shut down if the error occurs 255 times.
Clearing condition: Continuous run for about 10 minutes (normal)
Supposed
Causes
Supply voltage not as specified
Over-voltage detection circuit defective
PAM control part(s) defective
Troubleshooting
Note: If the model does not have SPM, replace the outdoor unit PCB.
Correct the power supply.
Replace the SPM.
Check for such factors for
an extended period of time.
(R0284)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
NO
YES
YES
NO
YES
NO
Replace fan motor and
outdoor unit PCB.
(Replace the outdoor unit
PCB.)
Check the supply voltage.
Rotate fan by hand.
Disturbance factors
* Noise * Power supply distortion
Repeat a
Turn on the
power again. System
restarted?
Does fan rotate
smoothly?
Supply voltage
as specified?
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