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Blue "C" wire is connected to "Y" on old thermostat. New thermostat has
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Blue "c" wire is connected to "y" on old thermostat. new thermostat hasThermostat blue wire Old thermostat has an unused blue wire, should i use it for nest 3rd.
Thermostat Blue Wire
Wiring Placement Honeywell Thermostat - Tech Support Forum
Home Owner's Knowledge Share: Connect Nest Learning Thermostat: 3rd Gen
New Thermostat Wiring - HVAC - DIY Chatroom Home Improvement Forum
Old thermostat has an unused blue wire, should I use it for Nest 3rd
Goodman Aruf Air Handler Wiring Diagram - Wiring Diagram