SiENBE04-507A Troubleshooting
Service Diagnosis 143
4.24 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 will be 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 doesn’t have SPM, replace the outdoor unit PCB.
Check the supply voltage.
Correct the power supply.
Check for such factors for a
long term.
Replace the SPM.
(Replace the outdoor unit
PCB.)
(R2957)
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Supply voltage as
specified?
Turn on the power
again.
Error displayed
again?
Disturbance factors
∗ Noise ∗ Power supply distortion
Repeat a couple
of times.
Caution
YES
YES
NO
NO
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