Thermostat randomly switches between heating and cooling modes without user input.

Safety first: No internal electrical work is required.

• Step 1 – Check mode: If the thermostat is in Auto mode, switch to Heat or Cool only to prevent automatic changeover.
• Step 2 – Adjust deadband: Increase the auto‑changeover deadband (temperature gap between heating and cooling setpoints) in the installer menu.
• Step 3 – Verify sensor accuracy: Compare the thermostat reading with a separate thermometer. If inaccurate, apply an offset or replace the thermostat if the sensor is faulty.
• Step 4 – Firmware update: Update firmware via the Atlantic app to correct any known auto‑mode issues.