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Mend Vaillant 824e Error Code Boiler

to fix?

I have a Vaillant turbomax plus 824e and keep getting a code F23 which i cannot find in the manual .
hot water go's from hot to cold and hot
Does anyone know what it means and how to fix this problem

mickdcc
February 2009
VaillantVaillant 824eBathroom Appliances, Baths and ShowersVaillant Error Code Boiler

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Vaillant 824e F23 Error - Fix & Help