It's a VCW 20/1 T3W H. That's all I can see written anywhere on the boiler.
When I say the pilot lights I mean the pilot flame is still lit. And I have turned if off and back on again when checking various things to see if the problem is solved.
Hello, first post on here.
I have an old vaillant combi boiler which has been working fine (or as well as it can for its age!) for the last year or so, bar a few diverter valve problems causing the radiators to sometimes heat up when running hot water.
Last week we turned the heating on, was...