Thermostat overshoots set temperature and room becomes too hot

Safety first: No electrical work is required for configuration changes.

Steps to reduce overshoot:

• 1. Check thermostat location:
  • Ensure it is not above a radiator, in direct sunlight, or near drafts.
  • If poorly located, consider relocating the thermostat or using a remote room sensor.
• 2. Adjust sensor calibration:
  • In the Fibaro app or device menu, find the temperature calibration/offset setting.
  • Compare with a reliable thermometer and adjust offset so readings match.
• 3. Enable floor sensor control:
  • For underfloor heating, use both air and floor sensors to limit floor temperature and reduce overshoot.
• 4. Reduce hysteresis:
  • Lower the on/off differential so the thermostat cycles more frequently but maintains a tighter temperature band.

When to call a professional: If overshoot persists despite correct settings, an HVAC technician can evaluate system sizing and response characteristics.