We've replaced a faulty diverter valve. The manual says the primary circuit heat exchanger air vent must be opened when refilling. How do I open it?
There's only a small black cap that comes off of what we believe to be the auto air vent (at the left hand side of the flue). Is this sufficient just to take the black cap off and that's all we need to do or is there some special tool required to allow access to vent it.
thanks in advance
There's only a small black cap that comes off of what we believe to be the auto air vent (at the left hand side of the flue). Is this sufficient just to take the black cap off and that's all we need to do or is there some special tool required to allow access to vent it.
thanks in advance