Is it possible to manually operate the pressure release valve on the Vaillant ecoTEC 637 boiler or is it just controlled by the boiler itself?
My pressure is at 3.1 bar and despite the filling loop being completely off, the boiler does not seem to be lowing its pressure back to an acceptable 2 or so bar.
Thanks and Happy New Year!!
My pressure is at 3.1 bar and despite the filling loop being completely off, the boiler does not seem to be lowing its pressure back to an acceptable 2 or so bar.
Thanks and Happy New Year!!