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I was hoping to make it last until the summer, move a couple of rads and get a new boiler but it sounds like its the heat exchanger or the pump, neither of which can be tested without trying the replacement item, not worth the expense on such an old boiler. Oh well thanks for your help anyway...

I wonder if anybody could help me. I have the above mentioned boiler that is overheating when running hot water, but is normally OK when just running the central heating, although it has cut out a few times on just CH. The boiler sounds like it is boiling the water and sending it up the...