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bengasman: the pump's a new one and a direct replacement (model, fitment orientation) of the one that had been working fine for twenty years. boiler stat is new. HERTSDRAINAGE2010: yep, done that - bled all rads and cycled the pump speeds till I couldn't hear any blooping, gulping and...

I've trawled through a heap of forum posts on the 60e before but this issue doesn't seem to have come up before (apologies in advance if it has and I've missed it). My boiler starts up fine and heats fine but trips the overheat after 10-20 minutes. Hot water and radiators all fine until the...