Checking The Refrigerating Cycle - Hitachi RAS-18FH6 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
Error (Gas leaking)
Perform a final check of operation.
(JUDGING BETWEEN GAS LEAKAGE AND
COMPRESSOR DEFECTIVE)
Lighting mode
Blinks
Self-
2 times
diagnosis lamp
LD301
Time until the
Approx. 10 seconds
lamp lights
Possible
malfunctioning
part
Blinking
(R410 A)
The values above are the theoretical ones.
Checking the IPM (main P.W.B.)
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.
– 84 –
Blinks Blinks Blinks Blinks
3 times 4 times 5 times 6 times
Within
Approx.
Approx.
10
30
seconds
seconds
Gas
Compressor
leakage
off
When the
self-diagnosis lamp
lights in the same
condition as above.
Blinks
8times
Approx.
10
seconds
Compressor
)