8 Troubleshooting
267
SMGB0087 rev.0 - 12/2013
8
Turn OFF power,
disconnect U, V, W
from compressor
terminals and restart.
Does the protecting
function activate? *3)
Yes
No
Failure of inverter PCB.
Replace it.
No
Restart operation.
It trips
Check the
compressor
Normal
Check the compressor.
Replace if faulty.
Abnormal
Is heat exchanger
clogged?
Remove clogging or replace
heat exchanger
Faulty inverter PCB.
Replace it.
Check the compressor
Check stop valve and
expansion valve
Check clogging of the heat
exchanger
Check fan motor
Compressor stops
after few minutes.
(Itc=1)
(Itc=21)*
Compressor stops
immediately.
(Itc=1, 12)*
Yes
Is the supply voltage
1~ 230v or 3N ~ 400
V±10%?
Check the capacity and wir-
ing of the power source
Yes
Yes
Yes
No
No
No
No
Is voltage higher than
170V (single phase) or
340V (3 phase) during
operation?
Is voltage higher than
170V (single phase) or
340V (3 phase)
at any
time?
Is the compressor
running current as
same as operating cur-
rent?
Is crankcase heater
ON?
Yes
* Refer to the item Cause code of
inverter stoppage for details.
Restart operation after
main switch ON
Charge refrigerant correctly
No
Is refrigerant
overcharged?
Is expansion valve of IU open-
locked in cooling operation?
Is expansion valve of OU open-
locked in heating operation?
No
No
No
Replace expansion valve
Yes
Yes
Yes
Yes
Is the discharge
pressure high?
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 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 parts”.
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