What happens if a thermostat is wired backwards?
Nothing would happen if a thermostat is wired backwards. The thermostat will NOT be damaged in any way, including a the screen being black. That is because the thermostat’s relay is “normally open”, meaning there is no path for electricity to travel, so voltage would be present, but would stop there. The thermostat’s relay has to be closed in order for the circuit to be complete and current to flow.
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