Nibe F1226 - Page 40

To prevent bacterial growth in the water heater, the compressor and the
immersion heater can increase hot water temperature at regular intervals.
The length of time between increases can be selected here. The time can be
set between 1 and 90 days. Factory setting is 14 days. Untick "activated" to
switch off the function.
NIBE™ F1226Chapter 3 | F1226 – at your service38