Thermostat overshoots set temperature, room gets too hot or too cold

Safety first: No high-voltage work is required; adjustments are made at the thermostat.

Steps to troubleshoot:

• 1. Verify system type: In installer setup, confirm the thermostat is configured for the correct system (forced air, radiant, heat pump, etc.).
• 2. Adjust cycle rate: Reduce the heat or cool cycle rate (CPH) in advanced settings to lengthen run times and reduce overshoot.
• 3. Check thermostat location: Ensure the thermostat is not in direct sunlight, near supply vents, or on an exterior wall that skews readings.
• 4. Calibrate temperature: Use the temperature offset/calibration setting to correct minor sensor inaccuracies.
• 5. Monitor performance: After changes, observe system behavior over 24–48 hours.

When to call a professional: If large overshoots persist despite correct settings and location, the thermostat's sensor may be defective and require replacement.