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vaillant boiler ecotec 831?

fault flashen 5er but boiler is still working

tom brennan
December 2010
VaillantHeating, Home Heating SystemsVaillant Boiler 831
heating dont come on when flame is on

jay
April 2012

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how do I rectify the fault as detailed below?

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Vaillant ecoTEC 831 Plus

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