Low-Voltage Detection Or Over-Voltage Detection - Daikin FVXS25FV1B Service Manual

SiBE06-708
4.25 Low-voltage Detection
U2
Remote
Controller
Display
Method of An abnormal voltage rise or drop is detected by checking the detection circuit or DC voltage
detection circuit.
Malfunction
Detection
Malfunction 25/35 class
Decision
Conditions
50 class
Supposed
Causes
Service Diagnosis
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)
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
Short circuit inside the fan motor winding.
or Over-voltage Detection
Troubleshooting
133