Thermostat loses date/time and Wi‑Fi settings after every power outage

Safety first: No high-voltage work is required, but turn off HVAC power if you remove the thermostat.

Steps to troubleshoot:

• 1. Confirm outage behavior: Note whether settings are lost only after long outages or even after brief flickers.
• 2. Update firmware: Use the Emerson app to check for and install any firmware updates that may address memory retention issues.
• 3. Factory reset: Perform a factory reset and reconfigure the thermostat, then test behavior after a controlled power cycle.
• 4. Improve power stability: If your home experiences frequent outages, consider a UPS for the furnace/air handler to reduce power cycling.
• 5. Replace thermostat: If settings are still lost after brief outages, the internal memory or backup circuit is failing and the thermostat should be replaced.

When to call a professional: For persistent power quality issues, consult an electrician or HVAC technician.