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My vaillant boiler is coming up with f22 what I can do ?

Hi my vaillant pro 28 is coming up with f22 no heating or hot water just wanting to know how can I sort it cause don't want to call someone out
Matthew, February 2014
not sure which model you have but ecotec plus manual says f22 = dry fire.too little water in appliance most common cause.maybe water pressure needs topping up.maybe youtube video would show how to top up using filling loop

jonh, February 2014
link Click here to see other fixes for Vaillant.