Re: sticking toilet press in flush button
never had to touch either of those. All I did was remove the button from the unit and check the small lever INSIDE that unit in the photo and put it back. i have looked at the SIAMP web site and it doesn't even mention the type I have, maybe because it has been upgraded
I think you are looking at the wrong part of the system which would normally be what I would go for as well, but in this case definately not . It was just a sticking button that is forward facing on the panel , not a top down setup .
it flushed ok and refilled ok but the refill did not actuated the vacuum enough to work the sprung little lever.
So it was just a case of a sticking lever inside that unit is my guess.
Te cistern is several years old and moving parts inside that unit may have time/wear causing it to stick partially. by taking it apart and refitting meant different contacts sections which is all it needed.
Have to say I understand what you are all trying to get at but in this case the solution was within that unit in the photo