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F75 error message on vaillant boiler?

Hi, I have the F75 error message on my Vaillant boiler this morning and I know it's simple for the plumber to fix but don't want to have to find one on Easter Sunday! Can anyone tell me what I need to do to get the boiler working again! Thank you

Jenny P
April 2010
VaillantHeating, Home Heating SystemsBoiler Simple Find

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