Thermostat overshoots the set temperature by several degrees before turning the heating off.

Safety first: This is primarily a configuration and placement issue; electrical risk is minimal if you do not alter wiring.

Steps to diagnose and fix:

• 1. Check thermostat location: Ensure the thermostat is not above a radiator, in direct sunlight, or near external doors. Relocate if necessary to a representative room position.
• 2. Enable appropriate control mode: In the installer menu, select the recommended control type for your system (e.g., PWM or adaptive control for underfloor heating, simple on/off for radiators) as per Danfoss guidelines.
• 3. Use floor sensor for UFH: For high-mass underfloor systems, enable floor sensor control or floor temperature limiting to reduce overshoot.
• 4. Adjust deadband/hysteresis: Reduce the temperature differential at which the thermostat switches off, within the limits recommended by Danfoss.
• 5. Monitor performance: After changes, observe system behaviour over several heating cycles and fine-tune settings if needed.

When to call a professional: For complex multi-zone systems, a heating engineer can optimize control parameters for comfort and efficiency.