i am going to part drain the system and flush through with sentinel x400 for a few days then drain completely, fit a new 3 port valve and refill with clean water and sentinel x100.
hello all, i have a conventional ch system - rads, boiler, f and e tank, room stat, pump, 3 way valve cylinder with coil etc. the roomstat has 3 wires 1 red and 2 black, and when demand is turned off one of the black wires goes from live to off. the problem is that when the room stat is turned down ...
