Thermostat loses time, date, or schedule settings after a power outage.

Safety first: Turn off HVAC power before opening the thermostat if necessary.

• Restore Wi‑Fi: Ensure the thermostat is connected to Wi‑Fi so it can sync time from the internet if supported.
• Check backup battery (if replaceable): Replace the internal battery with the specified Payne part.
• Reduce power interruptions: Avoid frequently switching breakers on and off; use the thermostat's own controls to change modes.
• Factory reset: Perform a reset and reprogram schedules. If the problem recurs, the memory hardware is likely failing.
• Replace thermostat: Persistent loss of settings indicates a defective thermostat that should be replaced.