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 does not come on when required and just makes a slight hiss, but when i tap it it comes on. Please help!
[/b]
[/b]