F86 Fault — Underfloor heating contact open or sensor issue

• Underfloor heating contact open
• Sensor disconnected
• Sensor defective

Click steps to track your progress.

1. 1

   Check the wiring connection for the underfloor heating contact.

2. 2

   Verify that the underfloor heating sensor is properly connected.

3. 3

   If the sensor is suspected to be defective, it may need replacement (contact a technician).