Alarm 254 (or 264, 203) Communication fault to Inverter — Inverter unpowered or broken

What does Communication fault to Inverter 254 mean?

This alarm indicates a communication issue with the inverter, typically lasting for 20 seconds, and suggests the inverter may be unpowered, broken, or has a poor connection.

• Poor connection between the PCB and the inverter.
• Inverter is unpowered.
• Defective inverter.

Click steps to track your progress.

1. 1

   Check the indoor module/control module display for specific action instructions.

2. 2

   Ensure all supply cables to the Heat Pump are connected.

3. 3

   Check the Heat Pump's fuses (F1, F2, F4) or automatic protection (FC1 / FB1) in the distribution box (AA2) on page 20.

4. 4

   If the issue persists, contact a qualified technician to inspect the PCB-inverter connection and the inverter itself.