Thermostat or app shows 'Sensor Error' for a specific room or remote sensor

Safety first: Wireless sensors are low-voltage; no high-voltage work is required.

Steps to troubleshoot:

• 1. Replace batteries: Open the Resideo remote sensor and replace the batteries with fresh, high-quality cells of the specified type and orientation.
• 2. Check sensor location: Ensure the sensor is within the recommended range of the thermostat or hub and not inside metal enclosures or behind thick masonry walls.
• 3. Re-pair sensor: Use the thermostat or app to remove the sensor from the system, then add it again following the pairing instructions.
• 4. Avoid interference: Move Wi‑Fi routers, cordless phones, and other RF devices away from the sensor if possible.
• 5. Test with another sensor: If available, pair a different Resideo sensor to see if the error is specific to one device.

When to call a professional: If multiple sensors fail or cannot stay connected, there may be an issue with the thermostat's RF module that requires replacement.