Underfloor heating controlled by the thermostat causes floor to feel excessively hot or damages floor covering.

Safety first: Turn off the underfloor heating circuit at the main isolator to prevent further damage to the floor.

Steps to diagnose and fix:

• 1. Confirm floor sensor presence: Check installation documentation to see if a Danfoss floor sensor was installed. If not, consider installing one in a conduit for proper control.
• 2. Verify sensor connection: Remove the thermostat and ensure the floor sensor wires are correctly connected to the designated terminals.
• 3. Set maximum floor temperature: In the installer menu, enable floor temperature limiting and set an appropriate maximum (e.g., 27–29°C for wood, 32°C for tiles) per Danfoss and flooring manufacturer guidelines.
• 4. Check sensor accuracy: Measure sensor resistance and compare to Danfoss NTC tables. Replace the sensor if readings are inconsistent with actual floor temperature.
• 5. Monitor after changes: Restore power and monitor floor temperature over several hours. Adjust limits if necessary.

When to call a professional: If the floor has already been damaged, consult both a flooring specialist and a heating installer.