How to program wall timer

Hi, i have a pulsacoil a class in my one bedroom flat with a wall timer that looks like the picture below.

I recently moved in here and I have no idea how to program this thing (no booklet anywhere either).

My pulsacoil is definately making hot water at the wrong times so adjustment is needed.

Any help in identifying what make the wall timer is would be appreciated.

There is also a wall button for boost as well as a button on the pulsacoil for boost. I am unsure what is for what.
The pulsacoil documents are not entirely clear to me.

Do not recognize it.

Try a Google reverse image search.

Or have a timer fitted which is easy to use.

To use the A class boost you would have to activate the button on the front.
Along with what ever else has been fitted.

Mike