Question about Honeywell CT3200 5-2 Day Electronic Programmable Thermostat Heater

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Battery Issue I just replaced the batteries on a Honeywell CT3200 thermostat. It still displays Battery Low message. I tried 2 sets of fresh-from-the-package batteries. Any suggestions? Thanks

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  • jpd_1978 Dec 02, 2008

    I have the same problem. bat lo light remains on even after putting in batteries backwards for 10-20 seconds and reinstalling the right way. I checked the circuit breaker and no blown circuits. any ideas?

  • briankamm Apr 08, 2009

    Same Problem. Temporarily reversing the batteries worked for me too.

  • Anonymous Apr 26, 2009

    I had the same problem and reversing the batteries worked. Now to figure out how to re-program this thing.

  • lfiorini May 13, 2009

    I have the same problem. Last year it was the same, I cleaned the contacts with alcohol and didn't have a problem again until this year. The battery low display continues to show after 3 sets of new batteries. No the display is blank.

  • Anonymous May 03, 2018

    Awesome, reversing the batteries temporarily worked like a charm. Heat back on now, thank you :)



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This worked! Thank you! It was 49 degrees in the house, and now the heater is working again.

Thank you and warm wished for the new year!

Posted on Dec 30, 2008

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I tried putting the batteries in backwards - it worked. Thank you so much!!

Posted on May 14, 2009

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Cleaned the top right battery terminal and its working like new. Thanks!

Posted on Dec 01, 2013

Found the MagicStat 3200 manual online. I just fixed that problem. "If ?bAt Lo? continues to display after replacing the batteries, set the System switch to OFF, insert the batteries backwards, wait for five to ten seconds, and return the batteries to their correct orientation. Then reprogram." Note: The battery connector is very temperamental. If your display is still blank make sure the connecting metal pieces are free of corrosion and both AA batteries are connecting to the metal, especially on the right side. (You can use a small nail file to remove some of the corrosion if necessary.)

Posted on Aug 16, 2007

  • James Daly
    James Daly Nov 30, 2013

    fixed!!! nail file!


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I have a two wire thermostat system. I switched the thermostat from a mercury one to the Honeywell CT3200 with dip switches set for my electric forced air furnace that is 31 years old. The white wire is...

If you look closely at the installation manual page 6&7 it tells you settings to use for your type of system. If I'm not mistaken you will need to back out screw "b" 360°. Hope this helps!

If you need further help, reach me via phone at

Jun 17, 2017 | Honeywell CT3200 5-2 Day Electronic...

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Even after replacing the battery, the programmable Honeywell thermostat still shows "Low Batt."

Turn control to off. Remove the batteries for at least one hour. If the display message still reads "bat lo", leave control off, batteries out, and disconnect the red wire on back and wait another hour. Reconnect red wire, put new batteries in and turn system on. It's like a reboot.

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It is actually CFS and it means call for service.

Jan 19, 2010 | Honeywell CT3200 5-2 Day Electronic...

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Bat lo flashing periodically

You need to change batteries. The bat lo light flashes when you have about 10% battery life left. Rus

Dec 05, 2009 | Honeywell CT3200 5-2 Day Electronic...

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The bat lo message will not go away even after replacing batteries.. No functions either

One thing you might want to try is to remove the batteries and wait for a few minutes until everything clears. It could take around 10 minutes or so. This will reset the thermostat. Also look on the back and/or on the board of the thermostat to see if there is a reset button.

I hope this helps! :)

Oct 29, 2009 | Honeywell CT3200 5-2 Day Electronic...

4 Answers

I replaced the batteries in my Honeywell CT3300 and the "Bat Lo" message won't go away even with fresh batteries. Is there a reset button or something?

Per manual do this: System set to Off Remove batterie Replace IN REVERSE POLARITY POSITION or 5-10 seconds Put back in with CORRECT POLARITY Reprogram per sticker on back of thermostat. Done. Just did this myself and it's simple and effective! PaulHaven

Oct 14, 2009 | Honeywell CT3200 5-2 Day Electronic...

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