Thermostat loses time, date, or schedule settings after every power cut.

Safety first: Disconnect power before opening the thermostat housing.

Steps to diagnose and fix:

• 1. Check product specifications: Confirm whether your Danfoss model is designed to retain settings during power loss. Some rely on cloud backup instead of local memory.
• 2. Enable cloud backup: If supported, connect the thermostat to the Danfoss cloud/app so schedules are stored remotely and restored after power returns.
• 3. Replace backup component (if accessible): Some models have a replaceable coin cell or supercapacitor. Replace with the same type and rating if user-serviceable.
• 4. Minimize power cuts: Avoid switching off the heating circuit at the breaker for extended periods. Use the thermostat's OFF or holiday mode instead.
• 5. Replace thermostat if design includes backup but it fails: Persistent loss of settings despite a functioning backup component indicates a PCB fault; replace the thermostat.

When to call a professional: For component-level replacement or warranty claims, contact Danfoss service.