Pool and Spa
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Absolutely the cold weather will effect the electronics. Especially if there is any moisture in the control under the overlay on the topside control. If the spa water gets below 64 degrees or so that will also cause the saltwater system to not function and that can throw up all kinds of errors as well.
You can try to reset the electronics by unplugging the spa for about 15 minute and plugging back in. I would also check the salt cell to be sure it is not scaled or needs to be cleaned off. If the cell looks good and the tub will not reset you will need a new topside control. You will need your model number of tub to order and they cost around $45 from INtex.