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thanks to all for prompt replies re- poss sticky aps - is there a correct method for testing aps ? as i have removed it , gently blown into it & can feel what i assume is a diaphragm moving in / out . and the best bit....... on refitting all seems ok ! too early to hang the flags out ??

thanx cjb1971 excuse my ignorance but whats aps ?

thanx fitz1 for advice re- sticky solonoid gas valve & i am aware diy gas dabbling a big no no - cheers again

hi there - would appreciate advice from anyone who can help have vaillant turbomax 828 approx 5 yrs old problem common to heating & hot water - burner seems only to ignite when it feels like it , fan starts- ignition process begins- sometimes ignites, sometimes will not ?? have replaced...