<https://www.diychatroom.com/threads/voltage-drop-at-thermostat.47448/>
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"I get 28v at the furnace controller at the R and C (red & blue wire) posts. At the thermostat i get 8v at the R & C (red & blue) wires. White,Green & Yellow are 28v. Is this normal or is this bad....Regards......Tom"
<https://www.diychatroom.com/threads/voltage-drop-at-thermostat.47448/>