Alarm Z1 Compressor does not start — Compressor start failure

What does 5506 mean?

This alarm is issued if the compressor has not started within 2 minutes after a start signal was sent. It suggests an issue with the compressor's connection, the inverter, or an internal error.

• Intermittent connection in the cabling between the inverter and the compressor.
• Temporary malfunction in the inverter.
• Internal error in the inverter.

Click steps to track your progress.

1. 1

   Check and ensure a proper, secure connection of the cabling between the inverter and the compressor.

2. 2

   Break power to the heat pump by turning it off and then on again (reset).

3. 3

   If the alarm persists after a reset, the inverter is likely defective and needs replacement.