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On my furnace there is a wire that is labeled C/Common. But at my thermostat there is no common wire.

Wires on furnace control panel:
W - White
Y - Yellow
G - Green
C - Common

Wires at my thermostat:
W - White
Y - Yellow
G - Green
Rh - Red
Rc - Blue No power(see below)
NO C - Common

Also the Rc wire has no power. I tested with a multimeter positive lead on Rc and negative lead on Y.

Can anyone help me?

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