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I was changing the batteries in my Honeywell RTH2300/RTH221 programmable thermostat and dropped it on the carpet. It exploded and all the parts were scattered on the floor. I put it back together, the best I could, but it isn't working right. It works, but not the way I had it setup. There is no display, so I can't change anything. I think I reassembled it correctly, less what appears to be a small magnetic strip. I don't know where that goes and I'm not absolutely certain I put it back together correctly.

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Thermostat is broken need to replaced

Posted on May 17, 2017


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Posted on Jan 02, 2017

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SOURCE: why will my programmable honeywell thermostat not keep changes to my schedule

Could be batteries need replacement

Posted on Apr 28, 2013

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Honeywell RTH221. Need user guide for thermostat, do you have?

It helps if you type the model correctly, and please always add the make! :>) We are FIXYA, we are not Honeywell, or mind readers. Please and thank you.

I have fixed your post.

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I am not familiar with this particular thermostat; however, here's some general information; I hope this solution will help you troubleshoot.
Multiple Thermostats set in 1 zone will conflict; the one with the lowest setting will be the determining Thermostat. Here's an option you can try yourself; my solution is 'hard reset' the thermostat - afterwards, i'm outta options. invest in external thermometer battery/natural types; & manually turn t-stat ON or OFF; Additionally, keep an eye on how much draw your AC is doing on your meter.

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Your tstat is not the problem. I've not yet worked on an oil furnace. I'm way down south. But either way, if your tstat was calling for heat(heat on), and you pushed a reset at the furnace, more than likely that reset is a safety. OK to reset, but now what ever that safety is preventing from happening, has failed and can not be reset until repaired. The reset should be an automatically opening switch upon unsafe operation. And manually closed to "reset" the safety. That safety is connected to something that is not working properly. Hope this helps!

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Hi Kathi,

I think its thermostat or ,thermo sensor is out of order and if it is controlled by electronic circuit it can be faulty.
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