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There is a bypass. water flows through the pump, into a T which diverts the water to the bypass and 3-port valve. from the T the bypass connects back into the return as the heating coil comes out the tank. Tried it shut and open yet same prob.

Thanks re. reply No pump still in its original pos. grunfos working like a trooper

So same old story. Vented system with a 3-port valve. (x2 new) All rads including the towel rails are on the CH flow. I moved the T/R in the bathroom and problem started. so I thought, of course, I looped it and there is reverse circulation?? this is what i have done to try find the...