I second, that really is not a openHAB question, you better ask the Viessmann community.
Bindings don’t actively manage anything.
But find out yourself. Just enable binding debugging.
Found the answer in the meantime. In German it is called “Pumpenkick”, at least for Viessmann devices. All pumps that have not been active for a certain time are activated for some minutes in order to prevent them from getting stuck.