Ok thanks i thought that was the case.I was intending to replace with a drayton ma1/679-3 which has a white,grey,orange,green/yellow and a blue wire.Do you know if the colors are the same on the old bg/drayton unit?
Hi does anybody know who makes the 3 port valve british gas fit? it has a blue head with british gas logo on it. it also has mv11qm on sticker.probably quite old.