Error 31 - Cooling flow sensor 1 fault

What does 31 mean?

The user interface displays '31: Cooling flow sensor 1', indicating an issue with the flow sensor specifically for the cooling circuit (Location: BX1 (X80)). This error typically triggers an automatic reset.

• Faulty cooling flow sensor 1.
• Damaged or loose wiring to the cooling flow sensor.
• Obstruction in the cooling water flow path.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the heat pump for 30 seconds, then turn it back on.

2. 2

   Check the cooling circuit for proper water flow and ensure no isolation valves are closed.

3. 3

   Allow time for the automatic reset to occur (default 6 hours) or use the manual reset function (Line 6711) if available.

4. 4

   Contact a qualified service technician to inspect or replace the cooling flow sensor.