Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater
I'm having the same issue. Please let me know if you find out how to turn it off. Ours is like a beacon in the night. My husband has been placing a baseball cap over it until we can figure it out.
You need the installation manual which can be downloaded at
go to setting 280 which sets the backlight options and select option 0 which turns on the backlight for 8 seconds when a button is pushed and then turns off.
This info is not in the owners manual, only the installation manual.
Posted on Oct 16, 2008
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Posted on Jan 02, 2017
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