Do the T5/T6 Pro Wi-Fi model thermostats require a "C" wire?
Last updated
7/23/21
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The T5/T6 pro Wi-Fi thermostats do require a common wire, also known as a "C" wire.
The "C" or common wire allows the thermostat to power itself, instead of using batteries. It must be connected to the C or common terminal on the furnace control board.
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