If yours is a separate thermostat from the AC, that is a two-wire going from the unit to the wall thermostat, then there's only a little you can check. The switch is nothing more than a physical barrier to keep the thermostat contacts open. If they close, or if the two-wire is shorted, either at the unit, or somewhere in between, then the unit will think you want it "on." Check wiring at both ends, and in between, as much as you can. If it's nothing obvious, go to the dealer.
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Marty and Martha
2015 Z-1 211RD
2012 Nissan Titan
Dalzell SC
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