Top marks to the Vaillant engineer - he took one look at the boiler and said "Yeah these lot all had faulty air pressure switches - should have been fixed under warranty"
He checked said air pressure switch - found it was grey and said that was the culprit - I obviously needed a black one.
Got...
Can anyone help me - or shed light on the mysterious workings of my Valliant boiler?
We have a Valliant Combi boiler - installed new in 2002. No idea the model no as I can't see a sticker or code anywhere!
But it has been playing up for the past 2 to 3 years. Mostly by not producing hot...
