Thermostat shows very different temperature from other rooms or from a reference thermometer

Safety: Power-off is only needed if sealing the wall or relocating the thermostat.

Steps to correct inaccurate readings:

• 1. Compare readings: Place a reliable thermometer near the thermostat and compare readings over 15–20 minutes.
• 2. Seal wall opening: Remove the thermostat (power OFF) and seal large gaps in the wall box or drywall opening with non-flammable insulation or foam to prevent wall cavity drafts.
• 3. Relocate if necessary: Move the thermostat away from direct sunlight, exterior walls, or heat sources.
• 4. Adjust offset: Use the thermostat menu to apply a temperature offset so the displayed value matches the reference thermometer.
• 5. Replace thermostat: If the reading remains unstable or far off even after offset and proper placement, the internal sensor may be defective. Replace the thermostat.

Note: Allow time for temperatures to stabilize after any changes before re-evaluating.