DIY Home Improvement, Remodeling & Repair Forum > Appliances > HVAC > Air handler will not blow




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Old 03-29-2012, 12:16 AM  
davvid20120
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Default Air handler will not blow

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 the 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?



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Old 03-29-2012, 07:38 AM  
paul52446m
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Originally Posted by davvid20120 View Post
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 the 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?
Your fan on speed is probably a different speed then the cooling. You will have to find the wires coming back from the blower to your electronic board , Find out what speed the cooling is on and check the power to see if you have 220 volts going to motor when calling for cooling, if you do
then you could have a bad winding in the motor. If you don't have power it could be the small cooling relay in your electronic board, replace board. paul


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Old 03-29-2012, 07:12 PM  
davvid20120
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Cool. Thanks for quick reply. Does a bad winding mean I would need a new motor? About how much would that board be if the board needs replace?

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Old 03-29-2012, 07:50 PM  
paul52446m
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Cool. Thanks for quick reply. Does a bad winding mean I would need a new motor? About how much would that board be if the board needs replace?
If you have a bad winding that would need a new motor. I have a service man that does all of your service and he also replaces all the parts so i do not keep up with the prices. Paul
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Old 03-30-2012, 09:56 PM  
thermalmedics
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Default check this

along with that great advice I would rule out the thermostat and low voltage wiring issues.

1. pull the thermostat cover off of the wall. touch red to green wires together. does the blower motor come on at all??

does it stay on if you put a wire nut on them?

if so than you have a bad thermostat. if not than yes I would say board and to check that you would need a meter. and like the good advice above. if you are getting 240v to the motor and the motor is not operating then it is bad. should be a run capacitor in there to check.

I was just thinking you wouldnt have the intermittent fan motor if a winding in the motor was bad it would just die.

I would check loose wires too. sometimes those wire plugs need a wiggle to tighten up. I would definately look there too.

make sure to pull the disconnect before working with wires, capacitors, motors too here is a quick

this is an outdoor disconnect so yours may be different at the air handler.
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Old 03-31-2012, 01:16 PM  
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thank you all for great advice. I will try this suggestions. I get one day off every two weeks, so when i get time I'm gonna do these things

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Old 05-22-2012, 09:39 AM  
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Last night unit stop working. I took thermostat cover off and touch red to green. Nothing. With wires still touching I went up in attic and removed fuses and replace after 5 minutes, unit immediately came on.

Looks like its the relay in the board. How do I check power going to the motor? Pull wire connection off touch with test leads



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