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I have error code f 75 on vaillant eco tec. have upped the water pressure and still code appearing, boiler wont lite

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  • Anonymous Mar 15, 2009

    It appears to be a manufacturing defect! There are a lot of people, including me, with the same problem within the first two years. I intend to inform Which? and the Watchdog.



    The installer did warn me about problems with the switching valve/pressure sensor but I thought of economy and chose the Vaillant!!

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Manual for a Vaillant combi boiler, ecoTEC pro28


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A friend fixed our condenser boiler with this tip - hope it helps you.

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