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honeywell digital thermostat can't connect to ac power

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i have attached a photo that shows the wires connecting the wall plate to the thermostat. does my wall plate

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  #1 (permalink)  
Old 11-13-2010, 01:28 PM
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Default honeywell digital thermostat can't connect to ac power
Model Number: TH8110U1003   Brand: -other-   Age: 1 - 5 years   

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i have attached a photo that shows the wires connecting the wall plate to the thermostat. does my wall plate have a terminal for me to connect a wire for ac power to the thermostat? right now my thermostat is not connected with ac power and runs only on battery. this is inconvenient because i have to change it every 6 months. this installation was done by a professional. i'd appreciate your help. thanks!



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  #2 (permalink)  
Old 11-16-2010, 10:31 AM
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im sorry that i misled you. there is no conductor landed on the c terminal.unless you have an extra wire behind the base plate you will have to either pull new wire or keep replacing batteries.check at the unit and see if there are extra wires.

Last edited by jtown : 11-16-2010 at 10:46 AM. Reason: i overlooked an important fact
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Old 12-27-2010, 04:53 PM
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I agree, you need the "c" wire, the "R" is one side of the 24V but the "c" is needed to complete the current. Look at the stat wire behind the baseplate shown on your pic to see if there is another wire in the bundles you can attach to the furnace and then to this baseplate. If not, pull a new wire behind the existing, if its not nailed down in the wall or go to home depot and find the type of stat we call in the industry as "power robbing". It is made to replace stats with 5 wires like yours but does not need the "c" terminal. It robs power from "R" to "W" or "Y". Anyway, this will at least get you out of the battery replacement and avoid pullling the new wire if its too hard.
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Old 01-27-2011, 10:32 AM
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Yes, you do need to pull another wire

SteveKJR








Quote:
Originally Posted by common man View Post
i have attached a photo that shows the wires connecting the wall plate to the thermostat. does my wall plate have a terminal for me to connect a wire for ac power to the thermostat? right now my thermostat is not connected with ac power and runs only on battery. this is inconvenient because i have to change it every 6 months. this installation was done by a professional. i'd appreciate your help. thanks!


Last edited by SteveKJR : 01-27-2011 at 10:35 AM.
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