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Hi Tony, The DHW push was firm. I think the problem was the switch as neither CH or DHW worked on Friday and just by moving the flow micro switch the both began working again fine. I replaced the flow micro switch on Saturday and the boiler has continued to function correctly on both...

Hi Tony, I think I found the problem. I removed the flow switch and then checked the mechanics were working correctly by checking CH in the on and off position and it moved in out correctly and was firm to depress when in the out position. However, when I first checked the electronic flow...

thanks Tony, Is this something I can easily test? Paul

Thanks for the response, probably badly worded so apologies for that! The stat was wired in 2 years ago and hadn't been a problem. We've had a couple of previous problems with the boiler - blocked venturi and a torn diaphragm in both cases the red lock out light. If I switch off the room...

Hi, We're having a few problems with our Biasi Prisma 28SE combi boiler. The DHW is only working when the CH on The lock out red light does not come on. It sounds like the initial start-up sequence starts but then nothing. If the CH is already on it diverts to DHW and no problem. That...