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Thanks for your replies. The hot water still works fine so does that mean its not the divertor valve? i have heard that Ferroli are the FIAT of the plumbing world so never a good start. Could it be the expansion vessel?

Hi, I have a Ferroli 25c Optimax boiler which I became the 'not so proud' owner when we moved into our new house a few years back and to be unusual our system has no room thermostat, instead we have to use the radiator valves which isn't ideal. We've had many problems along the way and recently...