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vaillant ecotec pro 28 f.75 code and no hot water or heating?

can any one advise me on how to fix or reset my vaillant boiler the code f.75 has appeared and i have no hot water or heating thanks
A Brind, September 2012
no heating only

Renu, January 2013
If still problem change water pressure switch or clean out. Mat be dirt in push fit connection you have to drain system

ltd, September 2012
Re pressure system to 1.5 take air out from auto air vent take out from pump reset boiler

ltd, September 2012
link Click here to see other fixes for Vaillant.