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What do you have for a zone valve? Do you have the manual? the wiring instructions are pretty clear. What's hanging you up?
I have a 4 wire zone valve. I hooked up as per manual and it will not open or fire boiler. The manual says to put neutral on the post in the sensor box that is labeled ground.
I have a 4 wire zone valve yellow & orange to the motor, 2 reds to a switch i guess. I wired as per manual and no valve opening or boiler firing. In the sensor control box were the manual said to hook up neutral it labeled ground. Should this wire go directly to a ground.