Thermostat shows incorrect indoor temperature (too high or too low compared to actual)

Note: Incorrect readings can cause comfort issues and short cycling.

• Step 1 – Compare with reference: Place a reliable thermometer near the thermostat and compare readings after 15 minutes.
• Step 2 – Adjust calibration: In the thermostat settings, use the temperature offset or calibration feature to correct minor differences (e.g., ±2°F).
• Step 3 – Improve location: Ensure the thermostat is not in direct sunlight, near supply vents, or above electronics. If necessary, relocate the thermostat to an interior wall.
• Step 4 – Seal wall opening: Remove the thermostat and seal any large gaps in the wall behind it to prevent drafts from affecting the sensor.
• Step 5 – Replace thermostat if drift is severe: If readings remain inaccurate even after calibration and location correction, the internal sensor may be failing.