Is it really true that there is a completely normal analog timer on the pump and, in parallel, the time control is carried out via the heating system? In our case, the circulation pump is also time-controlled, and I only have to adjust something on the heating system for changes, nothing on a timer.
According to the heating engineer, the info was: if the completely normal analog timer is running, the digital one in the heating system does not take effect. If we turn off the analog one, what we set digitally on the heating system runs automatically. But somehow I suspect that none of this is true...