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Cannot get new thermostat to work

I just replaced a cracked plaster wall in my dining room on which an old Honey well t87F 1859 thermostat was mounted. The stat was damaged during the demo and I went a purchased a new Honeywell CT87K. I thought this was a simple install but the furnace (oil, steam radiators) does not switch on when the new stat is installed. If you connect the two wires coming out of the wall directly, the furnace turns on. What am I doing wrong?

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  • bobbycagna May 11, 2010

    you have to make sure that the stat wires are on the right terminals. look at your boiler and see where they are. normally the wires on that stat and boiler will be color coded, meaning B would be for a blue wire, r would be for the red wire etc. Let me is this helps.

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  • 37 Answers

Didn't wire up correctly or if purchased a digital one didn't set up correctly, look at the instructions and should tell you how to set t-tstat up or if you have to remove or move jumper.

Posted on Apr 25, 2009

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