Alarm code
48
Activation of Inverter overcurrent protection device (1).
•
The RUN indicator flashes and the ALARM indication is displayed on the remote control switch.
•
The unit no., the alarm code and the unit code are alternatively displayed in the temperature setting section and the unit
no. and alarm code are displayed on the outdoor unit's PCB1 display.
* This alarm is indicated when the Inverter electronic thermal protection is activated six times in thirty minutes (retry
operation is carried out up to five times).
Activation conditions;
Inverter current with 105% of the rated current runs continuously for thirty seconds, or
Inverter current runs intermittently and the accumulated time is reaches up to three minutes in a ten minute period.
Refer to next page.
Restart operation.
No
Smaller than
activation current.
Yes (Transistor Module is normal.)
Is discharge pressure
high?
Check pressure and
refrigeration cycle.
Is the compressor
current larger than
activation current? *1)
Check the inverter
circuit board (PCB2)
connection. *3)
Normal
"2"
"4"
Check for clogging of
the heat exchanger.
Check the fan motor.
Replace the diode module.
Abnormal
Abnormal
Connect it correctly.
Transistor Module (IPM)
is faulty. Replace it.
Is the cause of
stoppage " " of
troubleshooting by
7-segments display
"2" or "4"?
Check the diode module. *2)
PCB1: Control PCB in Outdoor Unit
PCB2: Inverter PCB
*1): Regarding the activation current value setting, refer to
, see on page 330
.
*2): Regarding the checking or replacement of the diode module, refer to
Checking procedures for other main parts
, see
on page 267
.
*3): Regarding the checking method or replacement of the Inverter parts, refer to
Checking procedures for other main
, see on page 267
.
8 Troubleshooting
220
SMGB0065 rev. 1 - 12/2010
