Hitachi RAM-60QH4 Manuel De Service page 146

CHECKING THE REFRIGERATING CYCLE
Troubleshooting procedure (No operaton, No heating, No cooling)
If the indoor pipe or service valve
becomes frosted during heating of one
unit, check the operation of Reversing
valve.
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?
YES
Stop to operate and check the gas
pressure in balancing mode.
Normal
Checking the power module.
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)
Lighting mode
Blinks
2 times
Selfdiagnosis
Lamp
LD301
LD302
Time until the
lamp lights
Possible
malfunctioning
part
Outdoor air
Charge port pressure
temperature
Mpa(G)｛kgf/cm
(℃)
2.96｛30.14｝
50
2.62｛26.72｝
45
2.31｛23.58｝
40
2.03｛20.73｝
35
1.78｛18.14｝
30
1.55｛15.79｝
25
1.34｛13.66｝
20
1.15｛11.74｝
15
0.98｛10.02｝
10
0.83 ｛ 8.48｝
5
0.70 ｛ 7.10｝
0
0.58 ｛ 5.89｝
-5
0.47 ｛ 4.81｝
-10
Gas leaks.
Repair and seal refrigerant.
Perform a final check of operation.
– 158 –
Blinks Blinks Blinks
3 times 4 times 5 times
Approx
2-3 seconds
10
seconds
Compressor
Blinking
(G)｝
2
Outdoor
unit
（R410A)
Abnormal
Gas leaking
Blinks Blinks
6 times 8 times
Within
Approx
approx
10
30
seconds
minutes
Gas
Compressor
leakage
Off
Manifold valve
Closed