Error 33 - Heat pump flow temperature sensor fault

What does 33 mean?

The user interface displays '33: Heat pump flow temperature sensor error', indicating an issue with the sensor measuring the outgoing flow temperature of the heat pump (Location: BX1 (X80)). This error typically triggers an automatic reset.

• Faulty flow temperature sensor.
• Damaged or loose wiring to the sensor.
• Incorrect temperature reading due to system issues or air pockets.

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

   Verify that there is adequate water flow through the heat pump and no air trapped in the system.

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 sensor.