Thermostat loses date/time and custom settings after every power outage.

Safety warning: Turn off power before removing thermostat from wall.

• 1. Check for replaceable battery:
  • If the Lennox model uses batteries, replace them with fresh, high-quality batteries.
• 2. Minimize power interruptions:
  • Ensure breakers are not loose and avoid unnecessary power cycling.
• 3. Firmware update:
  • Install any available firmware updates that address memory issues.
• 4. Replace thermostat if memory still resets:
  • Internal backup components may be failed and not serviceable.