Thermostat displays temperature that is clearly inaccurate compared to other thermometers in the home.

Safety: Turn off power before removing the thermostat from the wall if relocation or insulation is needed.

• Step 1 – Compare readings: Place a reliable thermometer next to the thermostat and note the difference after 15–20 minutes.
• Step 2 – Apply offset: Use the thermostat’s temperature calibration/offset feature to correct small differences (within manufacturer limits).
• Step 3 – Check mounting location: If mounted on an exterior wall or above a heat source, relocate the thermostat to an interior wall in a representative room.
• Step 4 – Insulate wall opening: Add foam insulation behind the thermostat to block drafts from the wall cavity.
• Step 5 – Replace thermostat if extreme: If large errors persist even after relocation and offset, the internal sensor may be defective; replace the thermostat.