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My honeywell t8775 thermostat just went blank and now my ac just runs without colling down. Do i need a battery

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  • majahsty Jun 29, 2008

    Thanks Chill!

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This unit does not use a battery. It runs off of power from the furnace. Two possabilities. One is a problem with the low voltage power supply from the furnace. The other is that the thermostat died and needs to be replaced.

Posted on Jun 28, 2008

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  • 2 Check for oxidation buildup on battery contacts. Use electrical contact cleaner and carefully clean the battery contacts of any oxidation buildup.
  • 3 Reset the system switch.


  • Read more: How to Troubleshoot Honeywell Thermostats ' eHow.com http://www.ehow.com/how_6596826_troubleshoot-honeywell-thermostats.html#ixzz17aWIl2Xt

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