Rather a long shot here...but;
I got back this afternoon from a week away, and my boiler was showing an error. It is a "Valliant turbomax 828e" and the error code is F28, which the guide says is due to insufficient gas, an electrical error or to check the air vents.
The boiler would have been on, but not kicked in when I was away (no need) and was working fine when I left on Friday last week. I don't see why it's stopped working.
Any ideas what to try, before contacting someone to come out? (I've tried pressing the reset button). I'm sure it seems to fire OK (I can hear 'roaring'), but after 10 seconds it cuts out.
Cheers
J