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I have forced air heat and am replacing my thermostat with a Honeywell 4210D. All wires are correct but there is no power unless I put in the batteries, but that says it is optional. I have not blown a curcuit. all right now are on. With the batteries in, I am trying to do a systems check where my program is both 6 and 9. From that poibnt, I can not proceed. I should have power without batteries, but I do not. Can you help

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Hi,
The reason you do not have power is because you do not have a wire from the "C" terminal in the furnace to the "C" terminal in your t-stat....if you have an extra wire you can hook it to the "C" terminals and it will work...if not then you will have to run another wire of just run it on battery....
The old t-stat did not have that wire...

heatman101

Posted on Nov 07, 2010

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