Input Over Current Detection - Daikin FTKS20CVMB Service Manual

SiENBE04-401A

4.10 Input Over Current Detection

E8
Remote control
Display
An input over-current is detected by checking the input current value with the compressor
Method of
running.
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
Check No.7
Refer to P.141
Check No.8
Refer to P.141
If the model doesn't have SPM, replace the outdoor unit PCB.
Note:
Service Diagnosis
The following current with the compressor running continues for 2.5 seconds.
Cooling Heating: Above 12A
•
Over-current due to compressor failure
Over-current due to defective power transistor
Over-current due to defective outdoor unit PCB
Error detection due to outdoor unit PCB
Over-current due to short-circuit
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
∗ An input over-current may result from wrong internal wiring. If the wires have been disconnected and
reconnected for part replacement, for example, and the system is interrupted by an input over-current,
take the following procedure.
Get restarted and measure the
input current.
Input current flowing
above its stop level?
YES
Turn off the power and disconnect
the harnesses U, V and W.
Check with the inverter checker (∗).
Any LED off?
NO
Turn off the power, and reconnect
the harnesses. Turn on the power
Check No. 8
Check the discharge pressure.
Check No. 7
Check the installation condition.
NO
YES
Troubleshooting
Replace the outdoor unit
PCB.
∗ Inverter checker
Part No.: 1225477
Correct the power supply or
replace the SPM.
(Replace the outdoor unit
PCB.)
(R2952)
119