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Replacing thermostat. New programable thermostat installation diagram shows 4 wires. There's only two wires coming from the wall. Will the programable thermostat work with 2 wires?

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Correct. 4 wires are used for both heat & a/c. 2 are usually for just heat. Attach to contacts for heater.

Posted on Dec 24, 2016

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Yes it will. 4 wires diagram most likely for a heater and a/c unit.

Posted on Dec 20, 2016

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