Question about Honeywell CT3500 5-1-1 Day Electronic Programmable Thermostat Heater

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Honeywell CT3500 Thermostat

I broke the leads on the front cover of the CT3500 when I was putting new batteries in. Does anyone know where I can buy a new CT3500 or used as it would be cheaper than having a repairman come out. I had someone put this one in so the back part with the wires etc is still good. Thanks

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  • sweetsjgal05 Feb 06, 2010

    Please advise how to install the standard honey thermostat. I found the 1 that came with the house. Do I need to turn off the electric. On the back it has"W", "Y" "G". "R". I can install this temporarily until I buy a new thermostat. Not allowed out of the roads due to the storm. Thank you.

  • sweetsjgal05 Feb 06, 2010




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I had a talk with One of the Vendors and he stated that This Item Has been Discontinued and he recommended CT3451 5-1-1 Day Electronic Programmable Thermostat.

The above one is also Discontinued but i was successful in getting one at ebay :-

Let me know, if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Feb 06, 2010


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Posted on Jan 02, 2017


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Need manual for Honeywell thermostat ct3500

Here you go Carol.

Honeywell CT3500 Owner Manual

Have a great day!

Ponder/Meditate/Pray for Peace.

Mary Oliveau { hugs }

Jan 20, 2014 | Honeywell CT3500 5-1-1 Day Electronic...

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Need a manual

Hi Carol.

Honeywell CT3500 Owner Manual

Ponder/Meditate/Pray for Peace.

Mary Oliveau { hugs }

Jan 20, 2014 | Honeywell CT3500 5-1-1 Day Electronic...

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AC has stopped working. CT3500 thermostat. Had "replace battery" indicator on. Replaced batteries with fresh new ones. Now the blower is not working when AC is on. If I set the thermostat to Fan ON,...

Possibly - the fan is supposed to work in conjunction with the compressor. Otherwise the evaporator will freeze up.
Check to see if the thermostat can be reset to factory defaults because it definitely is not working right.

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if youre desporate for heat you could take it off wall and touch red and white together turns heat on .if you could get the same type you could simply use the new front

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Is there a temp differencial setting on these thermostats

Go to
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

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you have to have a thermostat! The thermostat tell the unite what to do. Get a new one.

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Sounds to me like you have a low voltage short. If the stat had no display until you installed the battery means there was no voltage for the stat to work. Putting the battery in proves the stat works, no motors turning on probably leads to a blown low voltage fuse generally a blade fuse on circuit board in indoor unit. Good Luck

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Do a search on fror the manual, also there is usually a short version of the instructions inside the front cover.

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