Hitachi UTOPIA RAS-4HVRP2E - Page 289

10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
287
10
Alarm code
48
Activation of Inverter Overcurrent Protection
• Thealarmcodeisashedonthe7-segmentdisplayoftheoutdoorunit.
• The alarm code is displayed on the wired controller of the indoor unit.
If instantaneous overcurrent or electronic thermal protection occurs on inverter as follows, the compressor stops. The
operationautomaticallyrestartsafterthreeminutes.Ifthisoccursagainvetimesinthenext30minutes,thisalarmcode
is displayed.
Condition of Activation:
1 Instantaneous overcurrent
Main causes: Compressor damage, output U, V, W are connected in reverse.
2 Electronic thermal
Main causes: Heavy compressor load, and so on.
3 PFC_A hardware overcurrent
Main causes: Short circuited PFC electric reactor L1, driver hardware is abnormal.
4 PFC_B hardware overcurrent
Main causes: Short circuited PFC electric reactor L2, driver hardware is abnormal.
5 AC input overcurrent
Main causes: AC input voltage under voltage, higher compressor load, and so on.
6 AC input overload
Main causes: AC input voltage overload, higher compressor load, and so on.