Hitachi RAC-25WXEN, Service Manual, Page: 45 / 52

CHECKING THE REFRIGERATING CYCLE
1. Troubleshooting procedure (No operation, No heating, No cooling)
Connect U,V,W phase leads to the
power module again and operate the
air conditioner.
Gas leaks.
Repair and seal refrigerant.
Is the self-diagnosis lamp mode as
shown on the right?
YES
Error (Gas leaking)
Normal
Perform a final check of operation.
When the
self-diagnosis lamp
lights in the same
condition as above.
The compressor is defective. Replace it
and seal refrigerant.
If the compressor checker for an
inverter type air conditioner is
available, re-check using it.
( )
(JUDGING BETWEEN GAS LEAKAGE AND
COMPRESSOR DEFECTIVE)
Blinking off
Time until the
lamp lights
Approx. 10 seconds
Approx.
10
seconds
Approx.
10
seconds
Within
Approx.
30
seconds
Compressor
Compressor
Gas
leakage
Possible
malfunctioning
part
LD301
Self-
diagnosis lamp
Lighting mode
Blinks
2 times
Blinks
3 times
Blinks
4 times
Blinks
5 times
Blinks
6 times
Blinks
8times
Stop to operate and check the gas
pressure in balancing mode.
Checking the IPM (main P.W.B.)
(R )
The values above are the theoretical ones. 32
45