Daikin AT12BV1LS Pocket Manual page 139

Troubleshooting
5.3.7 Low-voltage Detection
Remote
Controller
Display
Outdoor
Unit LED
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
138
U2
5 4
A 1 2
An abnormal voltage rise or drop is detected by checking
the detection circuit or DC voltage detection circuit.
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)
Supply voltage not as specified
Over-voltage detector or DC voltage detection circuit
defective
PAM control part(s) defective
1 1 4
3 4
Si10-417
Service Diagnosis