martski said:Thanks for that Tony.
Can I ask something else? What is the function of the Auto or Manual selector on the Honeywell 2 way valve body? At first this lever was loose but after I've opened and closed it loads and tapped the valve body with a hammer, as recommended in earlier posts, it now has some sort of sprung resistance and goes back to Auto by itself. Is this good?
It should be loose when powered up and spring back when no demand.