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Carrier thermostat Hello, My Carrier electronic thermostat is connected to a heat pump.  It was set to the COOL position during a summer thunderstorm when the AC suddenly began running no matter what the SET temperature was.  It works normally when I change it to the AUTO position.  The HEAT and EHEAT positions work normally. I tried cutting power to the unit for 2 days, after which it worked normally even on COOL, but after a short power failure it resumed the problem of running the AC continuously. I keep it on AUTO now, and it works fine for both heating and cooling.  Any ideas on making it work on the COOL setting again?

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  • bluene Nov 26, 2007

    Thanks, the dr. I was afraid that was the best solution. Also thank you for the recommendation.

  • Anonymous Mar 22, 2014

    makes no difference heating or cooling



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I hate to say it but Ive had trouble with Carrier's Tstats doing similar improper things. Unfortunatly the only repair is going to be replacement of the whole tstat. I recommend Honeywell's FocusPRO or VisionPRO tstat. Ive yet to have one fail and they have a 5yr warranty if they ever do.

Posted on Nov 26, 2007


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