Question about Honeywell Programmable Thermostat Heater

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Heat will not turn off


i turned on my heat for the first time this season and now it won't turn off. i had it set to 69 and it's up to 74 now. I've tried everything according to the manual and no luck. please help.

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  • Anonymous Nov 09, 2007

    I am having the same exact problem!

  • Anonymous Nov 09, 2007

    Mine is a Honeywell RTH6300B thermostat , set up for heat only. I have hot water baseboard heat. I've had to keep shutting off the furnace to get the temp. down. I have downloaded the thermostat installation instructions and reprogrammed the thermostat just to make sure it was set up correctly and it was. Still the same problem.

  • jstoer Dec 14, 2007

    I'm having the same problem. If I replace the batteries, it fixes the problem for a few weeks, but that is getting annoying. Did you figure out a solution?

  • Richard Pippin Dec 17, 2007

    I have a RTH230B attached to a Lennox heat/ac electric. It worked fine last winter when I installed it, but now it stays on all the time.

  • Anonymous Dec 19, 2007


  • michael2700 Dec 20, 2007

    I have the RTH230B and seem to be having the same problem.  The programing aspect of the thermostat does not seem to work it now only works to a constant temperature that I set it to.

  • Richard Pippin Dec 29, 2007

    Hi, I am following up on your request for more info. The thermostat kicks on once it drops below the preset temp but does not shut off once the preset temp has been reached. He heating unit is all electric (no heat pump) and continues to run hot until I manually turn it off. The A/C side works good, turn on and off as advertised.

  • ades Jan 18, 2008

    HI all-

    thanks for the advice. no luck and i've been away but i'm gonna have a friend come by and read what u guys said and see if he can take a look. There's warm heat and it is heating up the house, but if I have it on auto it will not run. I've been putting it on on and heat and manually turn it off when it gets warm and then turn it back on again as needed. I just had it put in last winter and had the AC/heat guy work on it. who knows. ne advice would still be helpful. thanks

  • Anonymous May 31, 2008

    i turned the heat to off but heat is still going on

  • Anonymous Oct 19, 2008

    installed honeywell last week. just turned it on and its so hot in here. the unit says its off but the heat is still on

  • Anonymous Nov 22, 2008

    Have Honeywell CT3200. Heat will not turn off.

  • omreht Nov 22, 2008

    Have Honeywell CT3200 thermostat. Heat will not turn off.

  • mazzy23 Dec 19, 2008

    I have a gas Carrier heater and a Honeywell T stat. Here is my problem. Sometimes the blower is on but fails to ignite the pilot. It keeps trying but shut off after a few attempts. Then it kicks on and heats to my setting and it's ok for a week or so, then fails again. Now recently, after changing the batteries in the thermostat, the heater won't shut off and heats past the settings. So basically i get No heat, Heat, or too much heat. Please help if possible.



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I can speak for ades. Is the burners and everything on, or is it just the fan blowing? Please reply, as the solutions for each are much different.

Posted on Dec 28, 2007

  • Rob Luna
    Rob Luna Dec 28, 2007

    jstoer, I don't know how these multiple questions work but I'll address you separately. If it used to work sufficiently before, as long as the outside coil isn't covered with ice that don't melt anymore, this could indicate a defrost control problem. If not, then you may have a freon leak problem. Do you know if the thermostat has an automatic or manual aux. heat switch? This is for the electric heat strips, depending on how cold it is outside, if its very cold, the heat pump may need some help. Let me know And hopefully after a better score than "thanks for trying" as I asked for more info, which I did not receive.

  • Rob Luna
    Rob Luna Dec 29, 2007

    jstoer;... Check the electric heat strips to see if they are coming on, when the thermostat aux. lights up. You need a meter to do this best, but I guess a visual at the heat strips will do, if you can get to where you can see them, they should be orange-ish after a few minutes and hot! If the strips are good and the A/C cools fine, then you have a problem with one or more of the following. 1) thermostat, you can probably replace yourself somewhat easily. These next things you kind of need a volt/ohm meter. 2) The reversing valve is not working, either mechanically or not getting the electrical power when needed. 3) The control relay on the board, sequencer or time delay. 4) I also asked this before, but like you, I don't know if it posted. Does the outside coil have excessive ice on it? Also does the outside fan motor run? If you have a lot of ice on the outside coil, the defrost board or sensor is bad. This is a very common problem. Most of these defrost boards have a test pin on it, that's easy to use. The defrost being bad will also cause the aux heat to come on, unless it is severely cold outside. Some units have an outside thermostat control in the condenser.

    P.S. I'm in California, so how cold is it there?


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When the problem occurs, the heat pump is running outside and I can feel and hear air coming through the system, so I'm guessing the fan is on too.

Posted on Dec 28, 2007

  • jstoer Dec 28, 2007

    The thermostat has an automatic aux heat switch. I have seen the light on and it has not been very cold. We live in the mid-Atlantic region. The thermostat was working fine with the AC, this just started happening when we switched to heat.

    I thought I answered your previous question, but I'm new to this, so perhaps it did not get posted. When the problem occurs, the heat pump is running as well as the fan.

  • jstoer Jan 03, 2008

    Thanks for all of your suggestions! I will check the heat strips when the Aux heat light comes on again. I have not looked at the outside coils, but I will when it happens again (usually every two weeks...) I just thought it was a thermostat problem, so I never looked outside. Yes, the outside system is running when the problem is happening.

    Right now we're in a cold "snap" - it's in the 20's with a high of 32. It's supposed to warm up in the next few days and be in the 40's to maybe even 60.

    So, with our cold weather right now, the aux heat is not on. When I noticed it on before, it wasn't this cold.

    Happy New Year!



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SOURCE: heat will not turn off

Call 1-800-341-0110, Honeywell Residential tech service.

Posted on Nov 15, 2007

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Heat will not turn off

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