Hitachi RAD-25NH7 Service Manual page 95

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.
Is the self-diagnosis lamp mode as
shown on the right?
Stop to operate and check the gas
pressure in balancing mode.
Gas leaks.
Repair and seal refrigerant.
YES
Normal
(0.39-0.98 MPaG)
(4-10 kg/cm
Gas leaking
(less than 4kg/cm G)
2
(less than 0.39 MPaG)
Perform a final check of operation.
(JUDGING BETWEEN GAS LEAKAGE AND
COMPRESSOR DEFECTIVE)
Lighting mode
Self-
diagnosis lamp
LD301
Time until the
lamp lights
Possible
malfunctioning
part
G)
2
Checking the system power module
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.
– 105 –
Blinks Blinks Blinks Blinks
2 times 3 times 4 times 5 times
Approx.
Approx. 10 seconds 10
seconds
Compressor
Blinking
When the
self-diagnosis lamp
lights in the same
condition as above.
Blinks Blinks
6 times 8times
Within
Approx.
Approx.
10
30
seconds
seconds
Gas
Compressor
leakage
off
)