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Right - fixed, It was the heat sensor (thermistor) £15 to replace from my local plumbers merchants. Replaced that and it fired right up. Thanks for the suggestions and help!

Right, was confusing the primary flow switch for a min, I'm not sure if this is working then without taking another look later today. I have a friend coming round who knows a bit about boilers and reckons he might be able to help me. Will check the sensor as well. Cheers guys

Yes when in CH mode or th CH being activated the pump start running and gets warm, but no ignition. Not sure if you are referring to the primary flow being the micro switch attached to the diverter valve. If so this is being connected properly as I have manualy removed and pressed, the pump...

I'm not sure it is either a Riva or Prisma, it just says Biasi 24s..... The sliding switch appears to be working correctly, when switched off the green light goes off and in constant or timed mode it activates the diverter valve correctly for CH. This has not been moved or changed recently...

Hi Had a search of forums but found nothing like... can anyone help? I have a Biasi 24S combi boiler and the CH is no longer working. The DHW is still working fine and firing up the bolier ok. The diverter valve is working ok and still pressing both switches (checked this as had problem...