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We just installed a honeywell thermostat, our furnace is an old furnace and now it won't shut off. it is a hot air oil furnace. any suggestions

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For a quick test -- remove the wires from the thermostat and see if the heater shuts off then,,, if it does shut off then the problem is the type ( model ) of the thermostat and it may not be compatible with that heater or there is something wrong with the way that the thermostat is wired. ( make sure that the thermostat is reading the correct temperature and is in fact in the off position ). also double check the wire color code at the heater and make sure that the right wires are connected proper.
what model is the thermostat ?

c...

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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Yep, you should be able to run your water furnace with the thermostat. Just wire it up same letter to same letter on both devices. If your thermostat worked before, it should work again. I couldn't find the honeywell part you listed, but the terminal designations tell enough on their own. Don't forget to shut off all power sources before doing any wiring, and to configure the control board on the water furnace before switching the thermostat to any active mode.

In case you don't have it, here's the install guide3 for the water furnace.
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Hey John, man that ole T87 has been around for a hundred years and I have installed many of them, but I cant remember the letters on the wiring. Seems to me that it is R-W-Y, any way you will use the R and W. I have a t87 at home still in the box and I could wait till I got home to help you but Im sure its the R and W terminal. Dont forget to set the heat anticipator. Set it the same as the current value of your gas or oil valve.

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Is sounds like you wired it correctly, The black is a little unusual perhaps its blue, anyway, try disconnecting the wires from the thermostat and see if it shuts off. If so, then it may need to re calibrated. I will need some more info to help you anymore.

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