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Question DetailsAsked on 7/19/2016

central air conditioner not working

We had a new gas furnace installed last year and now have noticed that our air conditioner doesn't work. When I set the thermostat to the fan for cool air, it does blow cool air out to the vents, however, the unit itself does not make any noise, and the fan on the a/c does not spin. Help!!

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Voted Best Answer

I think this is incredibly simple - I hope - especially if a new thermostat was part of the furnace installation. On most dual-control thermostats (furnace and A/C both in one) there are 3 mode settings - HEAT or FURNACE, FAN, and COOL or A/C (or similar terms). The FAN setting is just for circulation when the temp is acceptable or maybe when you don't want the A/C running like at night on less hot nights but don't want to openthe windows for circulation in the house - or if you are trying to air out a smell or steam or something like that (though opening the windows works a LOT better for that because FAN setting recirculates the odor in the house rather than exhausting it.

So - if your system has a COOL or A/C setting, slide/turn the switch to that.

If not and FAN is your normal A/C control setting (which would be odd) and the A/C is not turning on, perhaps the tech forgot to hook the A/C connection up if a new thermostat, or there is a switch on the furnace that also has to be flipped to A/C so the A/C rather than the furnace controls the furnace fan (which in a central-air system usually provides the airflow through the ducts and over the evaporator coil to provide cooling as well as moving the hot air in winter). Chech the owner's manual for the furnace.

Also, check if the A/C power switch or circuit breaker is off - when he was working on the system he may have turned that off to shut off the power to the A/C while changing out the furnace and forgot to turn it back on - though I have to admit it is AWFULLY late in the summer for you to just now notice the A/C is not working, unless you live in an area where an A/C is not really a necessity.

Otherwise, assuming you felt he did an adequate or good job on the furnace, maybe call him back to check this out. If it turns out to be a hookup failure on your part should be a free visit.

Answered 4 years ago by LCD

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