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My central air unit is not coming on and my thermostat has no display on it and it has no batteries.

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Check your breaker to the furnace.If your furnace loses power the ac will not run.

Posted on Jul 07, 2008

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Home air condition thermostat is blank. My home's central air condition stopped working. So the first thing I did was check the thermostat and it was blank. I then went down to the basement and got the...


Put new batteries in the thermostat. Make sure that the switch that power the furnace is in the "on" position. Sometimes people mistake that switch for a light switch and turn it off.

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assuming this is a central air unit, you have lost power to the heater giving you a blank display on the thermostat. Also, some thermostats require batteries for the display to work.

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Hi, Have you checked to see if there is power to this unit? I have not looked up the type of system you have, wall/window unit, central split system and so on. If the thermostat display said weak batteries and you installed them, it should start if it is programmed properly. If it is, the next step is to determine if it has power. If it does and will not start, we need to troubleshoot further into it. Get back to me on this. Let me know the type system you have. Thank you,
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Hello We have a Trane central air


Bad thermostat, improper wiring or bad circuit board in furnace. Turn off the disconnect outside.

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There is usually an overflow tray which has a shutoff valve when the tray is about to overflow water into your house. It is not located outside on your unit but inside where ever the condenser unit is. IF that tray is full of water, your unit will not turn on until it is emptied. Then you need to find out why the tray isn't draining...do you have a blocked drain pipe?

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Sounds like it may have lost power. Check the breaker and the fuse at the furnace. If they are all in the on position and working then it sounds like you may need a technician. If the display is blank on the thermostat you may also want to replace the batteries.

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