Input Over Current Detection - Daikin FTKS25BVMB Service Manual

Troubleshooting
4.9

Input Over Current Detection

E8
Remote
Controller
Display
Method of An input over-current is detected by checking the input current value being detected by CT with
Malfunction the compressor running.
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
Check No.7
Refer to P.123
Check No.8
Refer to P.124
Note: If the model doesn't have SPM, replace the outdoor unit PCB.
100
The following CT input with the compressor running continues for 2.5 seconds.
Cooling: Above 11A, Heating: Above 13A
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
again and get restarted.
Check No. 8
Check the discharge pressure.
Check No. 7
Check the installation condition.
NO
YES
SiBE04-302
Replace the outdoor unit
PCB.
∗ Inverter checker
Part No.: 1225477
Correct the power supply or
replace the SPM.
(Replace the outdoor unit
PCB.)
(R2952)
Service Diagnosis