Thermostat shows much higher or lower temperature than actual room temperature

Safety first: No need to access wiring for calibration.

Steps to correct temperature reading:

• 1. Compare with reference thermometer:
  • Place a reliable thermometer near the thermostat and wait 15–20 minutes.
  • Note the difference between readings.
• 2. Adjust calibration offset:
  • In the Fibaro app or device menu, locate the temperature calibration/offset setting.
  • Enter the difference (positive or negative) so the thermostat matches the reference.
• 3. Improve airflow:
  • Ensure the thermostat is not recessed deeply into the wall box or covered by curtains or furniture.
• 4. Consider external sensor:
  • If accurate room temperature is critical, install a Fibaro external room sensor and configure the thermostat to use it.

When to call a professional: If the internal sensor is severely inaccurate even after calibration, the thermostat may need replacement.