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Old 03-29-2012, 12:45 AM   #1
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Air handler blower will not come on?


I have a Carrier air handler and a Bryant compressor/air conditioner about 6 years old that supplies cool or warm air to the second floor.

When I turn on my thermostat to cool the air handler will not blow air. The compressor will come on and the evaporator coil and refrigerant lines are very cold. I can hear that faint noise that comes from the coil/refrigerant lines when you know it is working. If I take both breakers out at the air handler, wait about 5 minutes and then put breakers back in fuse box the air handler comes on.

First time I did this, it blew for a few days, second time a day, third time until it reach the lower temp setting at the thermostat and now it comes on for a second and stops.

I turn the A/C unit off at the thermostat, there was ice/frost building up on the coils. I have the fan set to 'on' at the thermostat. The air handler will come about every 10 minutes blow air for about 5 seconds then stop. I left the system set to fan 'on', and woke up in the morning to fan blowing constantly. Currently the therm. set to A/C off and fan to on and blower comes on.

Model # for handler: FC4DNF036000AAAA
Serial #: 3006A87948

It seems like capacitor problem, but then blower will come on. I don't see a capacitor. The wires from the blower motor, 1 goes to circuit board and 3 others go to this thing looks like a chunk of metal. On those same terminals are wires that run to circuit board. Is this a sensor?


Last edited by davvid20120; 03-29-2012 at 01:19 AM.
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Old 03-29-2012, 04:08 AM   #2
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Air handler blower will not come on?


Post a pic.

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Old 03-30-2012, 12:33 AM   #3
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Air handler blower will not come on?


Here are pics. let me know if you need anything else. What is the 3rd pic of?
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Old 03-30-2012, 04:49 AM   #4
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Air handler blower will not come on?


At the air handler. Jumper the the wires that the R and G of the thermostat connect to. If the fan runs, good chance its your thermostat. if it doesn't run, probably a bad board.
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Old 03-31-2012, 02:20 PM   #5
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Air handler blower will not come on?


thanks for the advice. I got the same advice on another forum. And gonna tried that when I get a day off, I get one day off every two weeks. what is the third pic of, with the wires come out of the top and bottom?
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Old 03-31-2012, 03:06 PM   #6
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Air handler blower will not come on?


If you're referring to this



it's a transformer, a step down 120/240 to 24 volt (control voltage) transformer to be precise.
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Old 03-31-2012, 10:14 PM   #7
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Air handler blower will not come on?


not exactly precise... lol it is a step down as you say but its primary voltage is 208 or 230
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Old 04-01-2012, 11:25 AM   #8
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Air handler blower will not come on?


thank you!!!
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Old 04-01-2012, 12:55 PM   #9
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Air handler blower will not come on?


Quote:
Originally Posted by carmon View Post
not exactly precise... lol it is a step down as you say but its primary voltage is 208 or 230
Try telling that to the voltage.

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