Lectrician
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Thats what happened to mine. There was three 22mm pipes to A/C One is combined flow to mid valve, one is return from cylinder, the other is flow to rads.
The return pipe from the cyl ends up at the boiler, as does all the return from the rads. They both just tee into the drop to the boiler.
As the 3 pipes where at the a/c, but no rad returns, the rad in the bathroom was bodged so the flow was on the CH flow, but the return from the rad was on the cyl return.
Sorry, Im no plumber, so hope that makes sence!!
I was offered the easiest option of having the rad on with the HW, or taking the return from the rad to the other rad return.
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