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davvid20120 03-29-2012 12:45 AM

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?

beenthere 03-29-2012 04:08 AM

Post a pic.

davvid20120 03-30-2012 12:33 AM

3 Attachment(s)
Here are pics. let me know if you need anything else. What is the 3rd pic of?

beenthere 03-30-2012 04:49 AM

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.

davvid20120 03-31-2012 02:20 PM

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?

Doc Holliday 03-31-2012 03:06 PM

If you're referring to this

it's a transformer, a step down 120/240 to 24 volt (control voltage) transformer to be precise.

carmon 03-31-2012 10:14 PM

not exactly precise... lol it is a step down as you say but its primary voltage is 208 or 230 :(

davvid20120 04-01-2012 11:25 AM

thank you!!!

Doc Holliday 04-01-2012 12:55 PM


Originally Posted by carmon (Post 889467)
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. :laughing:

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