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whats wrong with my central heating?

BaxiWM 51/13 RS transco came to fit new gas mains/piping to the house, when the gas was back on the boiler fired on the hot water cycle but wont fire on the central heating, it was ok this morning, anyone any ideas?
John, June 2012
Hard to say some unwanted went in gas pipe and damage boiler gas valve,or is it diverter valve

ltd, June 2012
link Click here to see other fixes for Baxi 51/13 RS.