F.86 - Fault: Underfloor heating contact open

What does F.86 mean?

This fault indicates that the underfloor heating contact is open, or its sensor is disconnected or defective, affecting the underfloor heating system.

• Underfloor heating contact open.
• sensor disconnected or defective.

Click steps to track your progress.

1. 1

   Press and hold the reset button for more than three seconds to try and clear the fault.

2. 2

   Check the connections to your underfloor heating control unit and ensure they are secure.

3. 3

   If the fault persists, contact customer service or your underfloor heating installer. A qualified technician will need to check the underfloor heating contact and sensor.