not absolutely sure on this, but i think fault f4 is a failure to ignite, go to glow-worms website, and you can download the manual for your boiler, it may give you more of an insight to the problem, jus make sure the gas is on as it wouldnt be the first time ive been to a boiler and it hasnt,
jazz drummer
January 2009
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.