Hitachi RAS-(3-6)HVNC1(E) Service Manual page 281

8 Troubleshooting
Compressor stops
immediately.
(Itc=1, 12)*
Restart operation.
Compressor stops
after few minutes.
(Itc=1)
(Itc=21)*
Is the supply voltage
1~ 230v or 3N ~ 400
V±10%?
Yes
Is voltage higher than
170V (single phase) or
340V (3 phase) during
operation?
Yes
Is voltage higher than
170V
(single phase) or
at any
340V (3 phase)
time?
Yes
Is the compressor
running current as
same as operating cur-
rent?
Yes
Is crankcase heater
ON?
Yes
N O T E
• *1) Perform the high voltage discharge work by referring to the item
checking and replacing the inverter components.
• *2) Regarding replacing or checking method for inverter components, refer to item
parts".
• *3) Turn ON the number 1 switch of the dip switch DSW1 on PCB2 (inverter) when restarting with disconnecting the
terminals of the compressor. After troubleshooting, turn OFF the number 1 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
267
SMGB0087 rev.0 - 12/2013
Turn OFF power,
disconnect U, V, W
from compressor
No
terminals and restart.
Does the protecting
function activate? *3)
Yes
It trips
Yes
Is heat exchanger
clogged?
No
No
No
Check the capacity and wir-
ing of the power source
No
* Refer to the item
inverter stoppage
No
No
Is refrigerant
overcharged?
No
Is expansion valve of IU open-
locked in cooling operation?
Is expansion valve of OU open-
locked in heating operation?
No
No
Is the discharge
pressure high?
parts".
Check the Normal
compressor
Abnormal
Cause code of
for details.
Yes
Yes
Yes
"8.4.7 Checking procedure for other
"8.4.7 Checking procedure for other
Failure of inverter PCB.
Replace it.
Check the compressor.
Replace if faulty.
Remove clogging or replace
heat exchanger
Faulty inverter PCB.
Replace it.
Restart operation after
main switch ON
Charge refrigerant correctly
Replace expansion valve
Check the compressor
Check stop valve and
expansion valve
Check clogging of the heat
exchanger
Check fan motor
parts", before
8