Question about Frigidaire FAA065M7A Air Conditioner

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The display on my central A/C thermostat went blank and air wouldn't come on. The circuit brekaer is fine. This happened 2 days ago, but came back on after about 2 hours. It ran fine yesterday until about 7pm and then came back on about 10pm. Today, it was running fine until about 2pm and has been off (blank) ever since.

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  • thomasmrober Jan 05, 2009

    I figured it out...can't believe how simple it was. There's a safety switch installed on the drain pipe coming out of my HVAC unit (mine's in a utility closet...some are in the garage). When the drain pipe gets clogged, it makes the water backup and a little bobber in the safety switch floats up and kills the thermostat. I disassembled it to test this and...viola. Interesting that it totally kills the thermostat instead of just turning off the air/heat. Anyway...I shop-vacced the water out and bought some tablets and threw them in the there to clean out the clog - hopefully that will help the flow (I've heard you can use bleach too).

  • Robert May 24, 2012

    Many AC units use a condensate safety switch that kills the power to the thermostat if the water gets backed up, especially if installed in a closet or attic. Best thing is too clean the line every sixth monthes.


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Sounds like the batteries in the thermostat are weak is this a battery powered t stat

Posted on Jan 04, 2009

  • Keith Miller
    Keith Miller Jan 05, 2009

    I have used vinegar which is less corrosive glad you got it


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