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15hxi glow worm boiler not firing?

Hi, my 4yr 15hxi is not producing any hot water. I have tried switching it on and off. The fan starts to whirr but no sparks etc show in the inspection window. I'm hoping someone clever will have an answer as cold showers are not good!
caroline, August 2011
2 things, is the pressure in the boiler correct? IE between 1 and 1.5 Bar check the pressure gauge. the second is that if you can still run the central heating then the domestic diverter valve is duff seek a replacement from Ebay

Richard Scanlon, August 2011
link Click here to see other fixes for Glow-worm 15hxi.