F28 Error on 5 year old Vaillant Ecomax 828/2E boiler?
My boiler has packed up and is indicating an F28 error. It looks like the air intake pipe has melted (what would cause that?), which I have now removed. I've ordered a replacement, but thought given that it's only a air intake pipe, once removed, the boiler should fire up. However It's still coming up with an F28 error.
What might be wrong?
Thank you in anticipation for your help.
Den
Den, November 2008