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vaillant 828e code f24?

i dont have any hot water or heating, sounds like there is air in the boiler. I have repressurised and there is no air in the rads.
claudia, October 2009
f 24 = water shortage.temperature rise to quick.

causes
pump blocked,insufficient pump output, air in the appliance water pressure too low

wirecutterman, October 2009
link Click here to see other fixes for Vaillant.