Input Overcurrent Detection - Daikin FTXS09HVJU Service Manual

SiUS04-904

4.10 Input Overcurrent Detection

4.10.1 09/12 Class
E8
Remote
Controller
Display
An input overcurrent is detected by checking the input current value with the compressor running.
Method of
Malfunction
Detection
 The following current with the compressor running continues for 2.5 seconds.
Malfunction
Decision
Conditions
 Overcurrent due to compressor failure
Supposed
 Overcurrent due to defective power transistor
Causes
 Overcurrent due to defective outdoor unit PCB
 Error detection due to outdoor unit PCB
 Overcurrent due to short-circuit
Troubleshooting
Check No.07
Refer to P.147
Check No.08
Refer to P.147
112
Cooling · Heating: Above 12A
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts damage may occur.
* An input overcurrent 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 overcurrent,
check the wires again.
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. 08
Check the discharge pressure.
Check No. 07
Check the installation condition.
NO
YES
Troubleshooting
Replace the outdoor unit
PCB.
* Inverter checker
Part No.: 1225477
Correct the power supply or
replace the outdoor unit
PCB.
(R10498)
Service Diagnosis