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Stepone23
thermostat malfunction

The room temperature rises on my honeywell 8500 thermostat when the backlight(feature 280) is on. The dim light works, the bright light lasts for 8 seconds. If I turn off the feature and the stat is dark the temperature is correct. Turn on the dim light and temp will rise 3 or 4 degrees in less than an hour. Is this the wiring, the current or voltage or what? This is the second thermostat i have used, then first one was ruined, it is a new Trane 13 heat pump and my installers are stumped. Need some help please.

dj1
Re: thermostat malfunction

The thermostat is probably defective.

High price doesn't always deliver high quality. Ask your installer to give you a non-programmable unit.

This is another reason I never install programmable thermostats.

Stepone23
Re: thermostat malfunction

Thanks for the info, I will go with non programmable one, I never use the programs anyway. I just wanted the backlight and cycle features. Thanks again, my installer is calling Honeywell and I am waiting for next info.

dj1
Re: thermostat malfunction
Stepone23 wrote:

Thanks for the info, I will go with non programmable one, I never use the programs anyway. I just wanted the backlight and cycle features. Thanks again, my installer is calling Honeywell and I am waiting for next info.

There are a dozen or more brands of what you need, with lights, for under $30. Some are under $20.

When changing over, don't mess up the wires.

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