Daikin AT12BV1LS Pocket Manual page 141

Troubleshooting
5.3.8 Over-voltage Detection
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
140
U2
An abnormal voltage rise 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 more than
430 V occurred the voltage detected by the DC
voltage detection circuit.
The system will be shut down if the error occurs 4
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
Si10-417
Service Diagnosis