Toshiba HFC R407C Service Manual page 42

Diagnostic procedure for check code
Check code
[14]
IPDU short circuit
protective operation
alarm (Power Transistor)
Is the power supply voltage
of the outdoor unit normal?
Yes
Is the connection of the wiring
connector on the IPDU PC board
normal?
Yes
Is AC 20A fuse working?
Yes
Is inverter compressor normal?
Yes
Is smoothing capacitor normal?
(2200µ F,400V x 2)
Yes
Check IPDU PC board.
42
Troubleshooting
Status of air conditioner
Operation stops
No
No
No
No
No
Operation cause
1. Outdoor unit power supply error.
2. Wiring error on IPDU PC board.
3. AC fuse disconnection.
4. Inverter compressor error.
5. Defective IPDU PC board.
Confirm the power supply line.
Modify connector of wiring.
Replace IPDU PC board and fuse.
Replace IPDU PC board and inverter
Confirm capacitance and appearance -
Replace IPDU PC board.
compressor.
Replace if faulty.