Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Honeywell Chronotherm III puts heat up contrary to programming

There seems to be a phantom setting in my chronotherm III thermostat. It puts the heat up at 4:40 am to 66 degrees, when the wake mode starts at 5:40 am at 66 degrees. The program is still in sleep mode at the time and sleep mode is at 62 degrees. I have disconnected, taken out the batteries to restart and it still does it. Any ideas ?

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  • 96 Answers

Sounds like t-stat is going bad

Posted on Jan 06, 2009

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Posted on Jan 02, 2017

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Display shows LLL


PDF]Chronotherm III 7 Day Programmable Thermostat - Honeywell

https://customer.honeywell.com/resources/techlit/.../69.../69-0352.pdf
O I" O 0. HEAT M10 COOL OF ow to operateyo. This Owner's Guide will show you how to get the most benefit from your new thermostat. Your new Honeywell ...

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Honeywell Chronotherm iv fan keeps running even when heat and cool turned off. How do I turn it off?


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I have a very old manual Chronotherm thermostat.


No. The clock is just the set back timer. Pull the battery and use the stat manually.

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My honeywell chronotherm III says -AC any ideas


The problem is your 24v power source. I am unsure as to why you put "other than power source or batteries". If you did indeed check that your thermostat is receiving 24v, then I would say that you have a bad thermostat. Hope this helps

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Thermostat problem; Honeywell chronotherm lll ' Low Batt. indicator Keeps blinking after Batteries replace. I chk'd batt. with elect. volt ntr. Was told to pull batt. and change ends with them , letthem stay reversed for 5-10 sec. then put them back in right order,and replace thermostat. No success!
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1 Answer

I have a honeywell III chronotherm thermostat /It won't turn on the heat or the air conditioning when turned to those settings, but it sometimes will when turned to "auto". The batteries seem fine, no...


it sounds like it is time to repalce the stat, auto is set to allow the fan to run only when the heat or a/c is on, the switch for heat and cool will select either, and the temperature lever should allow contact for the bulbs to bring on the desired component. there are no replaceable parts on a thermostat, or I would try to walk you through replaceing them. good luck.. I prefer the honeywell vision pro or the white rodgers 9500 series stats

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Replacing aging erratic honeywell chronotherm III


Hi, your replacement part can be purchased on amazon, take a look here: Amazon com honeywell chronotherm III thermostat. I hope this was helpful. Cheers

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1 Answer

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.

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