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

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Honeywell CT2800 Doesn't Follow Programming

I have a Honeywell CT2800 thermostat that I installed about 10 years ago. Within the last week, it has started acting up - the heat doesn't necessarily come on when programmed to. Sometimes it does, sometimes it doesn't. When it does, it will also sometimes shut off before the programmed temp is reached. Batteries are fresh, and the date and time are set properly. I am thinking that the thermostat needs to be replaced. Do they 'wear out' over time?

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Battery Issue

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!
Mary

Posted on Dec 30, 2008

  • 19 Answers

SOURCE: My Honeywell chronotherm IV Plus thermostat intermittent problem

The Chrono Therm 3 and 4's were some of the worst products that honeywell has EVER put out. I would suggest switching to the Vision Pro 8000, please consult your local HVAC company for more information regarding the change over.

Posted on May 17, 2009

  • 1 Answer

SOURCE: I need to reset the date and year

Hello,

I had exact same problem with RTH7500. Did not set the date properly at the beginning and than realized that there is no menu option to change the date after it is saved once (???!). I was very confused for few hours and wandering - trying to find changing option on thermostat menu; than I was looking online what can be done... I could not find solution...

Than I took out both AA batteries, open the thermostat (be very careful while doing this - you don't want to break plastic peaces that hold the thing together) and took out the button battery thinking that this will reset the thermostat... but it did not.

I repeated the same thing, but this time, while the button battery was out, I put two AA batteries back and this reset the thermostat... the old - blinking date appeared and I was very happy to see this on thermostat screen! This time I set the time properly and it works fine.

:)

Hope this will be helpful if you did not solve the issue yet... if you did, someone else might find this solution useful.

Posted on Aug 03, 2009

  • 2 Answers

SOURCE: I have a Honeywell CT2800 Thermostat and a message

it's just running your "return home" program, so it says "return". the FR above it is just meaning "Friday". They line up in a way that makes it look like the two words are together but they aren't, the week line is just right above the program line.

Posted on Dec 12, 2009

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I have a Honeywell CT2800 Thermostat and a message FR Return came on


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The Chrono Therm 3 and 4's were some of the worst products that honeywell has EVER put out. I would suggest switching to the Vision Pro 8000, please consult your local HVAC company for more information regarding the change over.

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