OK, thanks. Will refit and try altho hot water flow does seem to go A to B as shown on MV fitting instructions.
The pump has isolation taps and easy therefore to remove. Can this be reversed temporarily to test the solution ?
Thanks
Thanks Tony
Yes the flow is in the right direction and can feel the flow through the valve and pipes. The pump is on No 2 setting. Tried 1 But didnt seem to make any difference.
Not sure what an auto bypass valve is !
I have recently replaced a faulty 2 port MV ( ACL Drayton ) on the CH zone with a Horstmann 2 port MV. Everything appears to work OK but there is a brief but very loud clanging noise from the pipework around the MV when the system calls for CH and the valve opens - whether this call be from the...