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Hi Guys Thanks for taking the time to reply. I have had Ferroli out to the boioler, but not for a while. A plumber friend has suggested it may be the expansion tank, so will investigate further. I will see about getting the pipe work looked at on the Megaflo. I can't believe it can be...

Hi All I have had a look through some posts and there seems to be a lot of problems with these boilers. Here is my issue. Background Ferroli Optimax s35 Megaflo 210 Underfloor heating downstairs with 6 port manifold and 3 zone controllers. 5 Radiator upstairs with heated towel rail...