My old thermostat. . .

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Topic by MailmanShawn posted 10-04-2008 10:27 PM 2748 views 0 times favorited 7 replies Add to Favorites Watch
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2 posts in 3727 days

10-04-2008 10:27 PM

Is out of the wall, but only had one of the two wires labeled. So I know one wire is a “B” but the other is a mystery. Can ANYONE help me identify this other wire, or tell me how to so I don’t burn down the house? ANY help would be greatlly appreciated.

Mailman Shawn

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Dan Lyke

331 posts in 3911 days

10-05-2008 03:42 PM

Probably worth putting a volt meter across those two wires to see what they’re reading, but thermostat controls are usually really simple: Connect the wires, the furnace turns on, disconnect ‘em, it turns off.

-- Dan Lyke, Petaluma California, http://www.flutterby.net/

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2 posts in 3727 days

10-05-2008 06:50 PM

I have a new electric thermostat, and it has 7 possible coded inputs. Therein lies the problem.

View tenontim's profile


151 posts in 3911 days

10-05-2008 11:55 PM

I take it that you only have a heater hooked to the thermostat. The new electronic thermostats will control you heat, air, ventilation fans and coffee pot. Like Dan said connect them, it goes on, disconnect, off. If you look at the instructions for your thermostat, it should tell you which one to connect for just the heat. Usually these wires will just be completing the circuit to a relay, which does the rest.

-- Tim

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Dan Lyke

331 posts in 3911 days

10-06-2008 04:31 PM

On your new thermostat and its 7 connections, I’m not sure how those things are set up these days, but if one is “ground” then use a volt meter in “DC” mode to see if one of the wires you’ve got is positive and one is negative. Plug the negative one into the “ground” pin. If you don’t get a solid reading off the wires, the furnace is putting out AC on those wires and you’re on your own.

-- Dan Lyke, Petaluma California, http://www.flutterby.net/

View teehee's profile


2 posts in 646 days

03-12-2017 05:44 PM

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16 posts in 4 days

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51 posts in 30 days

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