How do you increase the water pressure on Vaillant Ecotec plus boiler?
I have the above combi boiler, I am not too sure about the model no. it is about 2 years old. The pressure is .4bar and I cannot figure out how to increase this, there are about 5 pipes below the bolier and I have tried opening the valve on what appears to be the water pipe, but I cannot hear any water going into the boiler. Thanks in advance
Sam, October 2008