Thermostat shows incorrect room temperature compared to other thermometers in the home.

Steps:

• Compare readings: Place a reliable thermometer near the thermostat and compare readings after 15–20 minutes.
• Check location: Ensure the thermostat is not near exterior doors, windows, or supply vents.
• Seal wall opening: Remove the thermostat and seal large gaps in the wall box to prevent drafts.
• Adjust offset: Use the thermostat's calibration/offset setting to correct minor differences (e.g., ±2°F).
• If readings are off by more than 5°F and offset cannot correct: The internal sensor may be failing; replace the thermostat.