Thermostat randomly loses date/time and reverts to default values after power interruptions

Safety: No high-voltage work is required.

• Enable network time: Connect the thermostat to Wi‑Fi and enable automatic time synchronization if available.
• Reduce outages: If your home experiences frequent brief outages, consider using a UPS on the HVAC control circuit (consult an electrician) or improving power quality.
• Firmware update: Update thermostat firmware to ensure proper handling of power loss and time sync.
• Replacement: If the thermostat continues to lose time after brief interruptions while other devices do not, its backup power or clock circuit may be defective. Replace the thermostat.