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Here at home where I reside we have an old school thermostat that has the mercury bulb that acts like a sensor, and in other cases it could just be as easy as replacing the batteries in the unit itself, usually a lid that hides them, sometimes it works
You are on the right track, you can hook the same 4 wires to the new thermostat without the jumper you had on the old thermostat. The jumper wire that is on the new thermostat can stay with no problems. Just connect the wires to the same terminals on the new one and your good to go!
Th e first thing I would recommend doing is to remove the cover from your thermostat and the three or four screws that secure base to the wall .Check to see that all wires are hooked to proper terminals. On most t-stats the R.c and Rh should have a jumper wire And red hooked to R.
To make sure you did not get a bad t-stat I would dissconnect all wiring from t-stat after noting how it's wired now. Then I would hook red and white wires together.This should
turn your futnace come on and run. If it does then I would just get t-stat exchanged.Hope this works for you. Good luck and thank you.
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.
I have the same problem. I am Trying to install a Honeywell RTH6400 but I only have a white and a black wire coming out of the wall. Do I have the wrong thermostat. The manual doesn't explain this siutation.
From the two red and two black wires (and the specs in the pdf), your new thermostat sounds like it's designed to directly control the line voltage (120 or 240) to the heater. That's the usual way baseboard heaters are controlled.
Could your wires be red, black, and (old, yellowed) white, the standard colors in a 3-wire power cable? Just the red and black should be enough to control a 120-volt heater so I don't understand what the white would have been used for. If it were my heater I'd take off the cover(s) -- with the power off, of course -- and find out what those wires actually connect to.
Buy some more thermostat cable with the same number of conductors inside it that you need. Twist the wires in the wall to the conductors on the new cable you just bought. Wrap the connections with electrical tape and pull the new cable with the old cable, starting at the furnace. You will then have all brand new conductors to fit to your new thermostat.
I connected the blue wire to the R and the white wire to the W on the old thermostat and shoved the new Honeywell 5-1-1 Day programmable thermostat up the first guys *** that i ran into at Canadian Tire
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