Compressor does not start — No heating or hot water demand, or system lockout

What does Compressor does not start mean?

The compressor may not start if there is no current demand for heating or hot water, or if the system is in a lockout period after a previous start.

• No current heating requirement from the climate system.
• No demand for hot water.
• Minimum time between compressor starts has not been reached (short cycle protection).
• An alarm has tripped, preventing compressor operation.

Click steps to track your progress.

1. 1

   Check if there is an active heating or hot water demand set on the heat pump.

2. 2

   Wait at least 30 minutes to see if the compressor starts automatically after the short cycle protection period.

3. 3

   Check the display for any active alarms and follow the displayed instructions if an alarm is present.

4. 4

   Ensure the heat pump's operating mode (Menu 4.2) is not set to 'add. heat only' if compressor operation is desired.

5. 5

   If the issue persists, contact your installer for further diagnosis.