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Thanks for your responses guys. I will be surprised is sludge is the problem as the boiler was brand new and fitted only 4 years ago. It would seem more linkely to be a faulty filling loop but I dont get how it can completely shut off to an extenet that zero fresh water gets through ??? I...

I have a saunier duval f28e boiler driving me nuts. I just re-fitted a rad that I had taken off before and as a result, the pressure dropped to 0.3. Undedrstandable and entirely expected. no problem I thought I'll just refill using the manual instructions. However, It wont fill and I cant...