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In my opening line I did say I replaced my existing valve, complete with actuator, with a new one. The point I was trying to make, was that I managed to get the old actuator working again, fairly easily & did not have to exchange the two micro switches, that I purchased from E Bay. I now have...

Hi, Just replaced my 20 year old 22mm Drayton 3 way valve, 679H340-30L0, for new MA1/679-3, to get my central heating system, working again. On stripping down the old actuator, to gain access to the two micro switches, using a multimeter on resistance scale I found that both switches, were open...