Question about Honeywell Programmable Thermostat Heater

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Honeywell thermostat RTH230B

The thermostat is not advancing through each program. It is stuck on program one, even though the time is changing on the thermostat.

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  • albaneseaj Feb 17, 2008

    The thermostat works fine in the heat program mode for all weekdays. On the weekend, it seems to get stuck in interval "3" regardless of the time of day. I've tried removing the batteries and reprogramming, advancing the clock and changing the progrom zones and nothing works. Any ideas?

  • bozobozo Feb 19, 2008

    I have a Honeywell RTH230B also and am now on my third one in less than 4 months. It has a tendency to "automatically" go into "hold" mode on its own when it is transferring from one program to the next. Then I hit the "mode" button to exit the "hold" mode into the correct program. Does anyone else have this problem? If so, what is the fix?

  • pas0826 Jan 19, 2009

    i want my thermostate to stay at 73 all day and night not using any program but my temps keep going from 78 down to 70 what the heck, i want 73 i just got this last week and am beginning to hate it what am i doing wrong,

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Sound like you need new one... take a look on amazon ecobee3 Smarter Wi Fi Thermostat Remote Sensor. It's not worth repairing it..

Posted on Dec 27, 2014

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After several months of calling Honeywell (actually someone in India), I found what seems to be the solution. I think I became such a pest (they had a lot of complains from me in their record) that they put me on hold and called someone at Honeywell Corp. The solution was to "reset the microchip". You do this by holding down the "Mode" button and while holding it down, take the batteries out for a couple of seconds (still holding down the Mode button) and then put the batteries back in and release the Mode button. 10 days have passed and it has been working perfectly. Hope this doesn'f jinx it! Good luck.

Posted on Feb 26, 2008

  • rockingther Jul 06, 2010

    u can just take the batteries out and put them back in reverse polarity...IT WILL RESET!!....secondly..it also depends on the outside temp. if its more.. then their is the problem with the system not the thermostat......thirdly check with ur isu settings...........if u want more solution......mail me on brijmvjce@rediffmail.com.

  • dlmoore03031 Feb 25, 2011

    Thanks - you just saved me going out (in the sleet and snow - cue orchestra) to buy a replacement. Plus I now look like a genius in the eyes of the wife!

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Ensure both your regular time setting and your programmed time settings have the correct AM/PM setting. If not, the displays will be different from what you think they should be.

If you're using the same programming for the entire week, ensure you've programmed it accordingly by pressing the "DAY" button for 3 sec. during the programming to include Sat.& Sun. Otherwise it will be default to a 5 day cycle.

Anytime you press the Mode button after you've exited the programming, it will revert to a "hold". This means you'll have to re-program to revert to program control---hit the exit button only once.

Posted on Feb 26, 2008

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SOLUTION #1 worked for me - my time on the thermostat was correct, the wiring was correct, and my programming was fine, but the a/c wouldn't come on even though the temp was set to 70, it was already at 77!

BUT - you don't need to hold down MODE after you take the batteries out; what you should do is hold MODE when the take them out - LEAVE THE BATTERIES OUT FOR 20-30 MIN, so the thermostat completely loses all electricity - then hold MODE when you put the batteries back in; wait 5 min and it should work

Posted on Apr 06, 2009

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These new thermostat can be confusing to say the least. On yours does the display say HOLD on the screen? If so, then the program override is set, thus negating the program.

Posted on Jan 16, 2008

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