Brand new machine, only moving left to right

Im sorry, Im unsure what the problem should be titled. Ive just built the sculpfun s30, but, it will only move left to right. I cannot find out why. Im not vert tech savvy so relying one YouTube and hopefully some advice here.
My son is an electrician, he put it altogether so it must be all correct, unless Im doing something wrong.
Please help

Check you have rotary turned off.

It shouldn’t be turned on, I haven’t been able to use the machine yet.

He did not say you turned it on, just that you should check it.

Recheck the plugs on both ends of the Yaxis cable. My S30 Pro was 99.8% plug and play.

Check these guides to get started with your S30:

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