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ok,thanks for all your help and advice,much appreciated :wink:

the boiler fires up intermittently about every minute or so when it is working, after half an hour this stops and all the radiators begin to get cold. i then tap the boiler and it immediatley starts up again.

ok see where you're coming from. there is a panel at the bottom which comes off and behind this is the housing for the control box which has an overheat button, and the thermostat control on the front of it, i usually tap around this area notat the top of the boiler.hope this helps. note i tap...

Basically just the slightest tap on the outside housing of the boiler usually does the trick.

I have posted the same question to glowworm and they have suggested 3 causes: air pressure switch, bad electrical connection or a sticking relay, does this ring any bells with anyone?

I have a glowworm economy plus 50f boiler which was installed in 1994. Theboiler will come on when required by the timer but cuts out after halfan hour to an hour. If i then go and lightly tap the boiler the boiler ignites again but then cuts out again after half an hour. Sometimes the boiler...