Thermostat shows temperature much higher or lower than actual room temperature, causing poor comfort.

Safety first: Low risk; only isolate power if relocating a mains-powered thermostat.

• Check location: Ensure the thermostat is away from radiators, direct sunlight, exterior doors, and drafts.
• Unblock vents: Make sure the thermostat’s air vents are not covered by curtains, furniture, or dust.
• Adjust calibration: Use the temperature calibration menu to correct small offsets (±1–2°C) based on a reference thermometer.
• Relocate if necessary: If the location is inherently unsuitable, have the thermostat moved to an interior wall at about 1.5 m height.

If readings remain erratic, the internal sensor may be defective and the thermostat should be replaced.