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The activation switch probably has one of the wires disconnected. You'll need to pull the switch and check that all the wires are connected.
The fact that when you switched the wires from the other slide and it worked would lead me to believe it's a wiring issue and not a bad valve.
I had to do this one time for the front jacks when it was 8 degrees above zero. At least you have some decent weather there.
Check the wiring.
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