Low-Voltage Detection Or Over-Voltage Detection - Daikin FTXS20G2V1B Service Manual

Troubleshooting

4.25 Low-voltage Detection or Over-voltage Detection

U2
Remote Control
Display
Method of Low-voltage detection:
Malfunction An abnormal voltage drop is detected by the DC voltage detection circuit.
Detection
Over-voltage detection:
An abnormal voltage rise is detected by the over-voltage detection circuit.
Malfunction Low-voltage detection:
„ The voltage detected by the DC voltage detection circuit is below 150 ~ 180 V (depending on
Decision
Conditions
Over-voltage detection:
„ An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer.
„ If the error repeats, the system is shut down.
„ Reset condition: Continuous run for about 11 minutes (50 class: 5 minutes) without any
„ Supply voltage is not as specified.
Supposed
„ Defective DC voltage detection circuit
Causes
„ Defective over-voltage detection circuit
„ Defective PAM control part
„ Layer short inside the fan motor winding
143
the model).
(The voltage is over 400 V.)
other error
SiENBE04-808_A
Service Diagnosis