8 Troubleshooting
260
SMGB0087 rev.0 - 12/2013
Alarm code
48
Overcurrent protection activation for RAS-(2-2.5)HVNP1 and RAS-3HVNC1
Turn OFF power and check
LED1 is OFF. Disconnect relay
connectors from compressor.
Turn ON number 1 of DSW301 on
inverter PCB2 and restart.
Does it trip?
Yes
Restart operation
after applying
current
Charge refrigerant
correctly
Restart expansion
valve
Check the
compessor
Is pressure
excessively high?
No
Yes
Check the stop
valves and
expansion valve
No
Restart operation.
Does it trip soon?
Yes
Check the
compressor
Check the power
source capacity
Replace the
electrical box
Is there any cause of
instantaneous voltage
decrease?
No
No
Yes
Yes, it trips
It trips
immediately
It trips after a
certain period
In case of 1~230V/50Hz:
Is the power supply voltage 230V ±10%?
Check the capacity
and wiring of the
power source
In case of 1~230V/50Hz:
Is the power supply voltage 187V during
operation?
Is it 170V (single phase) or more
during operation when other devices
are operating?
Is the compressor running current the
same as rated current?
Is current applying to
crankcase heater?
Is refrigerant
charged excessively?
Yes
Yes
Yes
Yes
Yes
No
Is lock of indoor expansion
valve opened at cooling
operation?
Is lock of outdoor expansion valve
opened at heating operation
Yes
Check for clogging
at heat exchanger
Check the fan
No
No
No
No
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