Softener frequently loses time and settings after short power outages

Safety first: Disconnect power before opening the control housing.

• Check manual: Determine whether your Viessmann model uses a replaceable backup battery.
• Replace backup battery: If present and accessible, replace the battery with the specified type, observing polarity.
• Use surge-protected supply: Connect the softener to a surge-protected outlet or UPS to reduce power disturbances.
• Board replacement: If settings are still lost after short outages, the control board's memory circuit may be defective and require replacement.