I have a "living flame" gas fire (Valor something or other) which has developed a habit of turning itself off. This is intermitent, sometimes it will burn all evening and sometimes it will turn off after a couple of minutes. When it does this the pilot light goes out too. My thought is that the thermocouple is faulty but I would like some more info before I call someone in to look at it (I have read the warnings about DIY gas work).

I've had a look at the Baxi/Valor web site and it looks like the model is the Valor Bolero, with the manual controls at the bottom. The fire is about two years old and has not been used a lot. When the fire started playing up we took out the ceramic coals and vacuumed out any soot and dirt. The chimney was swept before installation and the flue checked by both the sweep and the gas fitter who installed the fire (smoke pellet test) and it was ok.