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Mend Vaillant VUW 828 / 828e Boiler

vaillant vuw 828, central heating,what dose sh.f mean?

vaillant 828e when i put the boiler on the central runs for about min then stops and then stops and the process continues to do the same and a code of sf.h is show.also up stairs radiators are hot but down stairs are luk warm.hot water is fine.

jo
January 2009

Vaillant Vaillant VUW 828 / 828e Heating, Home Heating Systems Vaillant 828 Boiler

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Vaillant VUW 828/828e: SF.H Error & Heating Issues