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I've removed my old broken one & am about to fit the new one BUT i cannot remember which way round it goes, A pipe goes from a valve on top of the boiler to the pump & a pipe branches off upwards of of it just before it reaches the pump to a plastic tank, this one is slightly warm,the other...

Hello people i have dislodged a GREY wire from my central heating junction box, the wires orange,white,blue from my sunvic 3-port valve spring return mid position motorised valve are all connected but i haven't a clue were the grey one should go or if it's critical. Could some kind soul please...