Alarm Heat Pump Z2 compressor driver is too hot

What does 5389 mean?

This alarm indicates that the compressor driver for Heat Pump Z2 is overheating. This happens if the internal temperature sensor in the inverter's PFC module exceeds 80°C for 10 seconds.

• Defective inverter (if the alarm is repeated).
• Poor ventilation around the Heat Pump unit.

Click steps to track your progress.

1. 1

   Check for and remove any obstructions blocking the air vents or general airflow around the Heat Pump unit.

2. 2

   Ensure the Heat Pump is installed in an area with adequate ventilation.

3. 3

   If the alarm persists after ensuring proper ventilation, contact a qualified technician to inspect the inverter.