Troubleshooting
Si10-417
138
Service Diagnosis
5.3.7 Low-voltage Detection
Remote
Controller
Display
U2
Outdoor
Unit LED
Display
A
5
1
4
2
1
3
1
4
4
Method of
Malfunction
Detection
An abnormal voltage rise or drop is detected by checking
the detection circuit or DC voltage detection circuit.
Malfunction
Decision
Conditions
An over-voltage signal is fed from the over-voltage
detection circuit to the microcomputer, or the voltage
being detected by the DC voltage detection circuit is
judged to be below 150 V for 0.1 second.
The system will be shut down if the error occurs 16
times.
Clearing condition: Continuous run for about 60
minutes (normal)
Supposed
Causes
Supply voltage not as specified
Over-voltage detector or DC voltage detection circuit
defective
PAM control part(s) defective
Si10-417.fm Page 138 Wednesday, September 22, 2004 6:38 PM
