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My air conditioner digital thermostat has gone blank screen. It is Carrier thermostat, and I see a number on the thermostat, 997-9708210-3. I can't tell how the thermostat is affixed to the wall, but I can open the door and all there is a big electronic plate. Is there a work around for a hot weekend, until thermostat can be repaired/replaced?

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  • drp01 Jul 18, 2009

    I suspect there might be batteries in there somewhere, but all I see opening door is an electronic plate. Any thoughts on how it connects to wall? Can't see any screws, perhaps double sided tape. I hate to force it loose not knowing.

  • drp01 Jul 19, 2009

    I finally figured out how to get the thermo off the wall. YOu just pull the electronic plate out, and interior screws attached. I hooked blue to white wire, as there is no battery. Nothing happened.

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Get the front off and you will see the screws holding the control panel. The .3 amp fuse will be samwhiched between the board and the display panel.

Posted on Jul 19, 2009

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Hook up the blue wire to the whit bypass's the temp sender, but try replacing the batteries first K?

Posted on Jul 18, 2009

  • Bruce Hathcock Jul 19, 2009

    the plate is operated by batteries and wires one se t of wires calls the ac ito play this is normally blue and white, but if the batteries are out replace then to call in the thermal relay or you will not have cool air. I can tell you idf you look for the murecy vapor switsh and hook the one wire from one enfd to the other yo will get cold air, this bu passes the thermo switch butthe best thing to do is go to any place like diamond or any shop you can buy a new thermsotate and replace it for wire by wire color, this will make it work, if the thermal switch does not turn on the a then the fan is defective ry running colsd water o it to get it to cool, if that does not help then try to find where it is cold and hotand this will be your plugged spot causing the unit not to heat, try running cold water over it to ge *** to warm, and be sure to replace both fuses and kick the ac switch off and then on. if it does not coll your i over your head and need an expert ok?

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