What does F85 mean?

The flow and/or return temperature sensors have been installed on the same pipe or an incorrect pipe.

• Flow and/or return temperature sensors installed on the same pipe/incorrect pipe

Click steps to track your progress.

1. 1

   Check that the flow and return thermistors are clipped onto the CORRECT pipes, not the same one.

2. 2

   Check the resistance across both thermistors (requires specialist tools).

3. 3

   Check continuity down the wiring harness for both sensors (requires specialist tools).