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

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My Honeywell Thermostat has a "-AC" error. Nothing is running (fan, cool, or heat). What does this likely mean?

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  • 587 Answers

Go to honeywell.com
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.

Posted on Aug 31, 2010

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Posted on Jan 02, 2017

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