Thermostat randomly switches between heat and cool or runs both in short succession

Safety first: No high-voltage work is required; adjustments are made in settings.

Steps to troubleshoot:

• 1. Disable auto-changeover: Temporarily set the thermostat to manual mode (Heat or Cool only) to prevent rapid switching.
• 2. Increase deadband: If auto-changeover is needed, widen the temperature difference between heating and cooling setpoints.
• 3. Verify system type: Confirm the thermostat is configured for the correct system (heat pump vs conventional) in installer setup.
• 4. Review schedules: Ensure programmed schedules do not set conflicting heat and cool setpoints.

When to call a professional: If the system still appears to run heat and cool incorrectly, an HVAC technician should verify wiring and equipment operation.