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Discussion Starter · #1 ·
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
 

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Is the common {C} terminal on the thermostat wired to the furnace. 28v between R and W,Y,and G is normal if the stat is not calling for heat or cool or fan.
 

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Discussion Starter · #3 ·
The common C wire (blue) is wired to the furnace controller but not wired to the thermostat. I've been told this common blue wire will need to be used if i upgrade my thermostat to a programmable lcd readout type thermostat. Is this a fact?.........Tom
 
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