Hitachi RAS-(2-6)HVNP1(E), Service Manual

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8 Troubleshooting
269
SMGB0087 rev.0 - 12/2013
8
Are the power wires
passed through CT
(inverter element)?
No
Failure of inverter PCB.
Replace it.
No
Restart operation.
Yes
Check the
compressor
Normal
Check the compressor.
Replace if faulty.
Abnormal
Check transistor
module (*1)(*2)
Apply silicon to cover
entirely the space
Faulty inverter PCB.
Replace it.
Check the compressor
Is high pressure increased?
Check pressure and
refrigerant cycle
Check clogging for heat
exchanger
Check fan motor
* Refer to the item
“Cause of inverter
stoppage (24)” for details.
Compressor stops
after few minutes.
(Itc=21)*
Compressor stops
immediately.
(Itc=1, 12)*
Turn OFF power,
disconnect U, V, W
from compressor
terminals and restart.
Does the protecting
function activate? *3)
Pass the power wires
through CT
Yes
No
Replace transistor and
inverter
Check inverter
PCB
Normal
Replace transistor module
Abnormal
Abnormal
Is the space
between the
transistor module and
radiation fins entirely
covered by silicon?
Normal
Yes
Is heat exchanger
of clogged?
Yes
Remove clogging or replace
heat exchanger
N O T E
• *1) Perform the high voltage discharge work by referring to the item “8.4.7 Checking procedure for other parts” , before
checking and replacing the inverter components.
• *2) Regarding replacing or checking method for inverter components, refer to item “8.4.7 Checking procedure for other
parts” .
• *3) Turn ON the number1 switch of the dip switch DSW1 on PCB2 (inverter) when restarting with disconnecting the
terminals of the compressor. After troubleshooting, turn OFF the number1 switch of the dip switch DSW1 on PCB2.
• When the alarm code “53” is indicated, the outdoor fan motor (DC motor) ensure that DC fan motor is checked accord-
ing to the item “8.4.7 Checking procedure for other parts” .