Alarm 322 (or 425, 108) Persistent pressure switch or over-temperature alarm — Poor heating medium flow

What does Persistent pressure switch or over-temperature alarm 322 mean?

This alarm indicates 2 repeated LP/HP/FQ alarms within 2.5 hours, signaling persistent pressure switch or over-temperature issues due to poor heating medium flow.

• Poor heating medium flow.
• Disruption in supply voltage.
• Lack of refrigerant.

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 indoor module’s/control module’s fuses and temperature limiters.

4. 4

   Bleed the heating system to remove any airlocks that might impede flow.