I have just changed the old satchwell dm 3601 3 port valve for a Drayton 22mm Mid-position valve MA1/679-3, all is working fine until the heating only is on, it wont go over to the CH and Stays on HW. When the HW is on it all works as it should.
The JB is also Satchwell wth the relay (sorry don't no the model No)
The JB is also Satchwell wth the relay (sorry don't no the model No)