Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater
The green backlight on one of my brand new Honeywell UtilityPRO thermostats won't go off -- it goes dim, but not off, so we have this green glow in our room all the time. My other brand new UtilityPRO thermostat is fine -- a couple of seconds of inactivity, and the light goes off. There's no code 280 in the advanced functions... any ideas on how to set the backlight?
After posting that I was having the same problem, I found a solution.
I used these instructions http://www.hydro-temp.com/help/drawings/honeywell%2069-1894ES.pdf and followed the Installer Setup on pages 6 through 10. Basically you just need to enter the setup mode following the instructions, scroll to setting# 280 and change the setting from "1" to "0" then the backlight will turn off after 8 seconds. Don't change any other settings if you don't know what you are doing.
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Posted on Jul 24, 2009
The UtilityPRO program is described here:
and the manual for 85-3126 is linked at the bottom of the page. The instructions for the backlight are on page 22.
Posted on Dec 04, 2010
It is how they wired the unit. If it is wired to run on 24 volt it is on all the time if it is on 12 v it shuts off as it derives power from the battery. You have last years model.
Posted on Jul 01, 2010
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Posted on Jan 02, 2017
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