Question about Honeywell Rth110b Horizontal Digital Manual Thermostat

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My thermostat won't stop my furnace at the desired temperature"

My thermostat won't stop my furnace at the desired temperature. my furnace will not kick off at 68º. It will keep going until it's up in the 80s!

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SOURCE: Honeywell Chronotherm III

Try this link:

http://yourhome.honeywell.com/yourhome/Applications/TechLit/TechLitSearchResults.aspx

It looks like there are a variety of model numbers for the Chronotherm III. Hopefully you can locate your model number.

Posted on Dec 28, 2007

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SOURCE: thermostat does not follow the setting

If the thermostat is a digital /programmable you may want to recheck program to see if it has changed or been changed. If thermostat is not digital then it is prbably warn out and need replaced.

Posted on Feb 16, 2009

shastalaker7
  • 1515 Answers

SOURCE: Our Honeywell programmable thermostat is

Good Morning, and yes you said it. Anytime a stat doesn't come on when it is set for a call for heat or cooling, the sensor on the subbase of the stat has lost its ability to sense the correct temperature. I have seen mechanical stats last as long as 25 plus years, but that's truly amazing for a digital stat to last that long. Yes, replace the thermostat. I don't know what kind of system you have, but if its a gas furnace with an a/c, the wiring will look like this. You will have terminals marked R, Red, for the 24 volt hot wire, G, Green, Y, Yellow, and W, White for heat. Going back to the red wire, it should have RC and RH on it. There will be a normally red wire connecting the 2 terminals.The Red wire coming in can connect to either one, as they are all together. The new stat will come with the new Red jumper wire attached. So, if you do have a gas heater, this is very easy to install. The only terminals you will need to use are RH to RC for the incoming red, Y, G, and W for heat. Y is for cool, and G is for fan. Very easy. Now if you have a heat-pump, they have many more terminals and can be a problem wiring them. If you have gas, forget the heat pump. I wont confuse you by going there. If it is a heat-pump, contact me in the comment box to let me know, and I can help you there also. Get a new stat at Home Depot, Lowe's Hardware, or O.S. Hardware. You want a 5 day, 2 day programmable Heating and cooling thermostat, 24 volts.It will have everything you need. See if it takes batteries for the display, they may not come with those, it will say on the box. Turn off your power to heater, so you won't short out the new one.They come in 2 sections, first the stat that just snaps on, and the subbase that is screwed to the wall. It will have the wiring terminals on it. Remove a couple of screws and loosen wires and remove. Be sure you write down how the wires go in case they used different colors, you never know. You will be all set. Store the manual in a safe place for future use. I wish you the best.
Shastalaker7
A/C, Heating, & Refrigeration Contractor.
PS, Please rate me on this :))
Happy Holidays to you and family!

Posted on Nov 23, 2010

Testimonial: "I hate spending money needlessly replacing items that may not be the problem. Thank you for confirming my suspicions."

  • 1 Answer

SOURCE: I just bought a Honeywell RTH2300B and installed

New furnace and new thermostat. The new thermostat is digital and it will not go above 67. It's a Honeywell RTH2300.

Posted on Dec 29, 2010

  • 1033 Answers

SOURCE: I replace limit switch on my furnace heater with a wrong one and my thermostat sparked. My heater won't turn on now. What can I do?

Csn you check the 5 amp fuse on the Furnace control board to see if its blown?

Posted on Dec 11, 2012

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