Vokera 96 excel- DHW only luke warm?

I've got exactly same problem. Intially the DHW does not fire up, after I replace the diapharam, it worked for one day and now become lukewarm. Can it be that we replace the diapharam not in the correct way? I'd like to see anyone here can help us out?

DavidS
July 2011

I have the same problem with the exactly same model. Initially the DHW does not fire up. After I replaced the diaphram, it worked perfectly for one day. Afterwards, the firing is still doing perfect, but the water becomes lukewarm. I am interested to see anyone have any suggestion or answer here.

DavidS
June 2011