Checking The Refrigerating Cycle; Troubleshooting Procedure - Hitachi RAS-25CNH1 Service Manual

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
(0.39-0.98MPaG)
(4-10kg/cm
Gas leakage
(Less than 0.39MPaG)
2
(Less than 4kg/cm G)
Perform a final check of operation.
(JUDGING BETWEEN GAS LEAKAGE AND
COMPRESSOR DEFECTIVE)
Lighting mode
Blinks
Self-
2 times
diagnosis lamp
RAC-163CNHZ
LD301
LD302
Time until the
lamp lights
Possible
malfunctioning
part
2
G)
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.
– 112 –
Blinks Blinks Blinks Blinks
3 times 4 times 5 times 6 times
Within
Approx.
approx.
2-3 seconds 10
30
seconds
minutes
Gas
Compressor
leakage
Blinking Lit
When the
self-diagnosis lamp
lights in the same
condition as above.
Blinks
8 times
Approx.
10
seconds
Compressor