Thermostat reboots or resets randomly during operation

Safety first: Turn off power to the furnace/air handler at the breaker before tightening any wiring.

Steps to troubleshoot:

• 1. Inspect thermostat connections: Remove the thermostat and ensure all low-voltage wires are firmly clamped with no exposed copper touching adjacent terminals.
• 2. Check furnace board terminals: At the furnace, verify that R and C connections are tight and the thermostat cable is secure.
• 3. Reduce load on transformer: If multiple accessories (humidifier, zoning, etc.) share the transformer, it may be overloaded. A technician can measure current draw.
• 4. Firmware update: Use the app to check for and install any available thermostat firmware updates.
• 5. Monitor pattern: Note if resets occur when equipment starts; this can indicate a transformer or wiring issue.

When to call a professional: If resets continue after wiring checks and firmware updates, an HVAC technician should test the transformer and control circuits.