Troubleshooting
Si10-417
136
Service Diagnosis
5.3.5 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 5
times.
Clearing condition: Continuous run for about 60
minutes (normal)
Supposed
Causes
Supply voltage not as specified
Over-voltage detection circuit defective
PAM control part(s) defective
Trouble
shooting
Note:
If the model doesn’t have SPM, replace the outdoor unit
PCB.
Check the supply voltage.
Correct the power
supply.
Replace the SPM.
(Replace the outdoor
unit PCB.)
(R2957)
Supply voltage as
specified?
NO
YES
Turn on the
power again.Error displayed
again?
YES
Repeat a
couple of times.
NO
Check for such factors
for a long term.
Disturbance factors
∗
Noise
∗
Power supply distortion
A
A
Caution
Be sure to turn off power switch before connect or
disconnect connector, or parts damage may be occurred.
Si10-417.fm Page 136 Wednesday, September 22, 2004 6:38 PM
