Wireless Resideo smart thermostat or remote sensor shows 'No Signal' or 'Lost Connection'

Safety first: Turn off power to the HVAC equipment before opening any equipment interface module. Do not touch high-voltage components.

Steps to troubleshoot:

• 1. Check distance and obstacles: Ensure the thermostat and the Resideo equipment interface module or wireless sensor are within the recommended range and not separated by multiple metal walls or appliances.
• 2. Reduce interference: Move Wi‑Fi routers, cordless phone bases, and baby monitors away from the thermostat and interface module if possible.
• 3. Re-pair devices: Use the thermostat's wireless setup menu to rebind or re-pair with the equipment interface module or remote sensor following the Resideo installation instructions.
• 4. Power cycle modules: Turn off power to the HVAC system for 60 seconds to reboot the equipment interface module, then restore power and check connection.
• 5. Relocate interface module: If possible, move the interface module to a more central location with better line-of-sight to the thermostat.

When to call a professional: If the wireless link cannot be restored or drops frequently, an HVAC professional may need to relocate or replace the interface module or thermostat.