Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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MY A/C WAS WORKING FINE THEN JUST CUT OFF AND THE ELECTRONIC THERMOSTAT WENT BLANK I CHECKED THERE IS NO BATTERIES CHECKED THE DRAIN PAN AND THE BREAKERS ANY IDEAS WHAT IT MIGHT BE

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Check the transformer. Remove the thermostat face and use a voltmeter to check for 24vac between the R terminal and the C terminal. If it's not there check for power on the transformers primary and secondary sides. Replace the transformer if you have power on the primary and none on the secondary. If you don't have any on the primary you should look for a fuse or another circuit breaker.

Posted on Sep 13, 2010

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Posted on Jan 02, 2017

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The thermostat went blank and the unit quit working


Likely a float switch on the drain line or in emergency pan. Or batteries in the tstat are dead

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I have a braeburn 3200 thermostat that has went blank on me yesterday. I have checked the fuse box, no tripped breaker, i have checked the switch on the furnace, its on, and there are no batteries. Im not...


If there are no batteries in the thermostat then the furnace was being used to power it. To make sure it is just a thermostat problem, you can jumper the power and heat wires that connect to the thermostat, usually red and white, or terminals R and W. If the furnace comes on, then you need a new thermostat. If that doesn't work, you have lost power at the furnace somehow. If the breakers are good, and the furnace switch is on, then you can have a bad door switch inside the furnace, a bad transformer in the furnace, or a bad circuit board if equipped. If there is a circuit board, they usually have fuses somewhere on them too that can blow. Just be sure to cut power off at the breakers before checking. Hope this helps and good luck!

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If you have a float switch on your drain line and the drain is backing up this will cut power to the tstat. Drain slowly drains, float switch resets, power comes back to tstat. That's my educated guess. But, is there batteries in the tstat?

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Carrier a/c thermostat was working fine, then display went blank!


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Compressor for air will not cycle on.


Check and see if you have a common wire on the thermostat. If you do not, then you will need to replace batteries if applicable.

If you do have a common wire, then batteries are not necessary for thermostat operation.

Even though the thermostat wires are secured properly and the thermostat worked fine in the heat mode, it doesn't mean it will work for the AC mode.

If you want to check the thermostat in an easy manner, you will need to jump out the Red and Yellow terminals at the thermostat. Be sure to turn off power first to the furnace. After jumping out, restore power to furnace. If the unit comes on, then your thermostat is bad. If the unit fails to come on, you have another issue. You can repeat this process at the outdoor unit with the low voltage lines if you feel capable. If unit comes on, your problem lies between thermostat and outdoor unit. If your unit fails to start, your problem lies within the outdoor unit.

Be sure to check any drain pans, float switches, or cut-out safeties installed that may cause this. Many contractors will wire in drain safeties to the outdoor unit to shut down the compressor in the event a drain line has clogged and backed up into the emergency pan. Of a condensate pump has failed.


If you do not feel you are capable of this, you may need to contact a local professional to come diagnose the situation. But those are a few simple tasks that you can complete yourself to narrow down a problem.

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THERMOSTAT DISPLAY GOES OUT AND A/C DOES NOT WORK UPSTAIRS. TOOK SAME UNIT AND PLACED ON DOWNSTAIRS BASE AND IT WORKED.


check drain pan in attic to make sure water has not caused float switch to cut low voltage to thermostat off.

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