The thermostat overshoots the set temperature; the room gets too hot or too cold before the system shuts off.

Steps:

• Check placement: Ensure the thermostat is not in direct sunlight, near lamps, electronics, or supply vents. If it is, consider relocating it to an interior wall.
• Adjust cycle settings: In the Kasa app, look for advanced settings such as cycle rate, temperature differential, or swing. Increase the differential slightly to reduce overshooting.
• Verify system type: Confirm the thermostat is configured for the correct system type and stages, as incorrect settings can affect control logic.
• Compare temperature: Use a separate thermometer to compare the room temperature to the thermostat reading. If the thermostat reading is off by several degrees, the internal sensor may be drifting.
• Replace thermostat: If placement and settings are correct but overshoot persists with inaccurate readings, replace the thermostat.