“I have a york brand thermostat Model S1-THEC11P5Y Can thus replace it? It had wires Red,white,yellow & black”

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• This thermostat requires the blue(common) wire to provide contestant voltage. The York must have been battery powered.

  Answered by FrankieB 3 years ago

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• Hi Scott, we will be happy to verify if this Wi-Fi thermostat will be compatible with your system. We need to know which terminals are being used by these wires on your existing thermostat, feel free to contact us at (800) 633-3991 or on social media. - Maria

  Answered by Resideo Team 3 years ago

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