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heating gone on vaillant 828e?

had fluctuating hot water on boiler, told to get flushed had exchanger flushed, now got lovely hot water, no heating.
boiler fires up when heating switched on, but no lights.

sorry put my question on someones answer.
debbieleec, September 2009
probably faulty diverter valve.

Ian, September 2009
link Click here to see other fixes for Vaillant.