We have a gas central heating system and our problem started last year, when the boiler and pilot light kept cutting out. We had a couple of engineers in, one who changed the wiring saying it was wrong? and another who changed lots of parts including the gas valve and it did get much better. In fact it was working perfectly between December and last week. Last week my husband bled one of the radiators, whether this caused it or whether it was the change to a milder temperature, I have no idea but since then, the boiler cuts out after being on for a couple of hours, sometimes sooner. The boiler and pilot light cut off. It is in fact the gas valve that shuts down and sometime you can't restart it for an hour or so.
Does anybody have any idea what this might be.
Thanks in advance