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Issue Resolved: heat pump unit with no dedicated OB wire. : r/Nest
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The RiteTemp Support Site - Y, O, B, G, R, C* Wiring Steps
Is the 'C' wire in my thermostat labeled as 'B'? : r/ecobee
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Calling all HVAC/thermostat experts - 💬 Lounge - Hubitat
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The Thermostat Wire Color Code You Need to Know
thermostat - Wire going between O terminal and B terminal - Home Improvement Stack Exchange
