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F75 Vaillant boiler?

I have a Vaillant ecoTEC plus 824. Woke up this morning no heating or hot water boiler has F75 on it. Had plumber look at it but he can not work out problem please help
Verycoldlady, January 2011
777

888, February 2011
Three possible issues (in order):
Low pressure
Faulty CH pressure sensor
Faulty pump

Carefree, January 2011
link Click here to see other fixes for Vaillant.