Over-Voltage Detection - Daikin FTKS20DVMW(L) Service Manual

SiENBE04-507A

4.24 Over-voltage Detection

U2
Remote
Controller
Display
An abnormal voltage rise is detected by checking the specified over-voltage detection circuit.
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
If the model doesn't have SPM, replace the outdoor unit PCB.
Note:
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)
Supply voltage not as specified
Over-voltage detection circuit defective
PAM control part(s) defective
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check the supply voltage.
Supply voltage as
specified?
YES
Turn on the power
again. Error displayed
again?
YES
Repeat a couple
of times.
NO
NO
Disturbance factors
∗ Noise ∗ Power supply distortion
Troubleshooting
Correct the power supply.
Check for such factors for a
long term.
Replace the SPM.
(Replace the outdoor unit
PCB.)
(R2957)
143