Alarm 494 - Fault in inverter, Heating not working

What does 494 mean?

The inverter has attempted to heat up the compressor but failed, resulting in heating not working. This indicates an internal fault within the inverter unit.

• Fault in the inverter.
• Discharge sensor (BT14) has come loose from its mount.
• Defective compressor heater circuit.

Click steps to track your progress.

1. 1

   Turn off the Heat Pump at the main power switch for a few minutes, then turn it back on to reset the inverter.

2. 2

   Check the indoor module/control module for any other related alarms or diagnostic messages.

3. 3

   If the alarm persists and heating is not working, contact a qualified NIBE service technician to diagnose and repair the inverter.