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Recently my Gloworm back boiler has started to sound like a steam engine when the burner is running. The noise will die off after about 3 or 4 minutes and the burner will continue running. The functionality of the boiler does not seem to be effected with both hot water and heating performing...

I have an old Gravity fed system using a Gloworm back boilder. Basically the CH works fine but two days ago the HW stopped working. :evil: I checked the hot water feed to the heat exchanger at the top and bottom of the HW cylinder and both seem to be cold. One is showing faint signs of...