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How do i operate a honeywell standard nonprogrammable t8400 digital thermostat?

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How do I adjust the day.

Posted on Aug 03, 2008

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heatman101

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Hi, I have a Honeywell Thermostat T8400 (non-programmable.) The screen is blank and will not come back on. I've unplugged it from the wall and turned the electricity off and on in an effort to reset it. It...


if you thermostat doesnt use batteries and it has no power, that means there is a problem with the air conditioing system itself. 90% of the time it is a safety switch such as a float switch (drainage problem), which cuts the power to the system to prevent damage to your house from condensate water leakage or just further damage to the system itself. Call the a/c guys, this is going to require expertise.

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