Thermostat reboots randomly or freezes and becomes unresponsive

Safety first: Turn off power to the HVAC system at the breaker before removing the thermostat or touching wiring.

Steps to troubleshoot:

• 1. Check for patterns: Note if reboots occur when equipment starts, suggesting a power dip, or randomly.
• 2. Inspect wiring: Remove the thermostat and verify that R and C wires are firmly connected at both the thermostat sub-base and furnace board.
• 3. Check transformer load: Ensure no additional devices have been added to the 24VAC circuit that could overload the transformer.
• 4. Update firmware: Use the Emerson app to check for and install any available firmware updates.
• 5. Factory reset: Perform a factory reset to clear any corrupted settings.
• 6. Relocate if overheating: If the thermostat is in a hot location, consider relocating it.

When to call a professional: If reboots continue after wiring and firmware checks, the thermostat may need replacement by an HVAC technician.