Blower motor in AC unit not coming on
I have a Trane XE 80 that has decided to stop blowing cool
air. The outdoor component seems to be working properly (ie. the fan motor starts
up when I turn AC on at the thermostat), but the blower motor inside the house does not turn on. I opened up the Trane and found that the circuit board controlling
things is an Intell-Ignition (part no. CNT03076). The red LED on the circuit board steadily
blinks, which (I think) is as indication that it is operating properly...or at least it thinks it is operating properly. I removed the blower motor connections
from the board and connected 120VAC directly to the motor and it ran just fine, so I think the blower motor is fine. So I am guessing the thermostat could be the problem. Does anybody have any ideas on how I could troubleshoot further before just replacing the thermostat? Does anyone know what the voltages should be on the inputs to the ignition controller for the various thermostat settings?
View related: Blower Motor Wiring reversed?2011-10-28 02:12:47With the triple digits 100-115 temps out here in Oklahoma I've found the upstairs A/C cannot keep up with the heat. Herein lies problem as I see it. I think the blower motor is wired incorrectly. In the winter the air blowing out of the registers are far greater than in the summer. Its just a trickle in the summer. Not enough air is moving to adequately cool the upstairs. My downstairs unit, (separate A/C heating unit- top from bottom) blows a great amount of air. Filters have been cleaned, same goes for condensers fins outside-All cleaned.
Below are photos.
Here is what I have:
Three wires coming in and five wires coming out of the Blower motor. Here is how it's connected, also see pics below.
Three wires / Five wires (blower motor)
Red ------- Blue
Black ------ Black
White ----- White
____ ------ Red Capped
____ ------ Green connected to housing
On the blower motor is a label showing the wiring diagram.
Another label is found on the shroud or blower motor housing.
The 2nd photo shows how it is connected.
Does this connection confirm the blower motor is connected improperly, esp for summer use? In other words, as connected is this why in the summer the A/C air discharge is so light? Naturally, if it is incorrectly connected how do I then correct it?
Looking fwd to your help?
Carrier 48GS unit turns on, but no heat2011-12-07 02:37:53hi everyone.
i'm very cold. lol
my husband is out to sea right now, and here i am alone with a broken hvac. i replaced the blower wheel in the blower motor, and put that back into the unit and hooked up all the wiring.
the unit turns on, i can hear it running, and hear a 'clicking.' there's no air coming out of the vents though.
could it possibly have to do with the ignition? could that be why the blower motor/wheel isn't kicking on and blowing air into the house?--because there's nothing ignited? how would i go about getting that to light?
the led on the circuit board isn't flashing. it's just on so it's not indicating any error. i had some concerns i might not have hooked up the motor right, but would the unit even turn on if the wiring was all off? in theory, if everything was hooked up right, shouldn't it just having do to with the heat source?
thanks for any advice you may have for me!...
Burning smell from AC vents? How do I test to see if it's the blower fan?2012-08-15 20:25:54I have a plastic burning smell coming from the vents when the AC turns on. The blower fan is not blowing but I can hear the compressor outside running.
When I open up the air handler, I can see that it starts smoking when I turn on the unit from the thermostat, and I can see the blower hum, but not turn.
Being the super intelligent guy I am, this tells me that the issue is a burnt out blower motor.
Can I buy the motor and fan together as one unit to make installation easier? The fan is already rusted pretty badly anyways....
Heil N9MP1 not working2011-11-26 10:36:57My ac unit isn't blowing. The outside unit is working but not the inside. I've tried bypassing the thermostat, hooked the black fan wire up to run constant, and cut the control valve off for five mins with no luck. The blower wheel is dirty, I know I should change the filter more then I do. Is there any thing else I can try to make sure it's the blower motor before I attempt to replace it. Also, there's a little box on the right side that the motor that hums alittle. I felt it so I know it's coming from it....
Replacing AC blower motor2011-11-02 21:09:22Hi all,
The blower motor in my AC unit died, and I was quoted roughly $800 to have it replaced. I contacted a local HVAC supply store and they said a blower motor for my unit would be ~$150, with a 5mfd capacitor at ~$10. However, when they found out I wasn't a licensed contractor, they wouldn't sell me the part because they didn't want the liability associated with me working with 208v. Is this repair really that difficult/dangerous? I'm a handy guy, and it didn't look like $600 dollars worth of labor to me to replace the blower motor... I can just shut the whole unit off at the breaker, so what's the danger associated with the electricity?
Thanks for the time everyone,
Trane blower question2011-11-28 11:38:18I have a Trane TUC080B9V3A0 with the variable speed blower. The blower quit while using AC, and the lines to the outside compressor were iced up and the unit still running. Iced up because of no airflow past A coil in plenum?
Blower was removed from furnace. Motor appeared to spin freely, but 10A cartridge fuse in motor control on end of motor was blown. New fuse blew again when fan was set to on at thermostat. There is 115V to the motor controller when trying to run fan from the thermostat.
How do I determine if I should replace the motor, the controller, or both? Is this a DC motor? How do I just check to see if the motor is still OK? Thanks...
lennox blower motor help2011-10-28 19:32:37I have an older lennox downdraft furnace. The blower motor recently quit working while using the a/c. The outside unit is working as it should. I switch the t-stat fan switch to on and the blower still did not start up. I also tried to turn the furnace on, the burners fired up, but the blower still did not kick on.
I have been pretty good about changing my filters every 30 days, however, upon further inspection it was quite dirty inside. Even if I get it going I think I should still pull the blower and clean it.
When I turn the fan to the on position, I am getting a buzzing sound. The buzzing sound is coming from a wiring box located to the left of the cam-stat and gas valve. Will there be a capacitor inside that box? Any tips on how I can determine if this is a bad capacitor or motor?...
Consolidated Home AC/Heater Blower Motor2011-11-02 03:38:06I have a Consolidated home furnace installed 1997, model ST9141B1001, and the a/c blower works and then shuts off, apparently of overheating. I was told the blower is obsolete and finding a new motor unlikely. A new furnace was suggested at $2300. Can some other blower motor be used or is there a place that sells old Con. motors, since Cosold. is out of business? It seems crazy and expensive to replace the whole unit for a motor....
Furnace Motor Runs Slow2012-08-23 20:21:03I have a 5 year old Armstrong Hiboy direct drive oil furnace that also provides A/C from an outdoor Trane unit. A few nights ago with the A/C on, there was barely any air coming from the registers. Opening the furnace access panel, the blower was running but very slow. I shut the unit off and then turned it back on and the blower did not turn but made a humming sound. I turned off the unit again, gave the blower a spin, turned it on and it was now running at a normal high speed. After running about an hour, I cycled the power again and the blower was back to running slow.I haven’t pulled out a meter yet to test, but reviewing the wiring (black, blue and white to the motor) and schematic, there is a relay switch (with low voltage violet wires) and a fan limit switch. Just wondering if these components could be the issue or if it’s the motor itself? Bad starter cap or winding?Thanks!...
Blower motor going bad?2011-12-10 11:16:31Alright so here's the problem. Just purchased a house, installed new thermostat (old one was busted to hell) and for a few minutes the blower would not come on.
Made sure it was wired correctly, made sure the A/C was on, next step was on to the air handler. I live in Florida so A/C here especially in the summer is a MUST.
Anyways so i open the air handler and hear a humming noise coming from the blower motor. So long story short, i took my screwdriver and started to spin the blower, after doing that the motor took off and everything started working fine.
So for now i have my thermostat set to have the 'fan' constant ON instead of auto until i can figure out the problem.
Does this mean my motor has gone bad and i need a new one? That's my assumption because it seems to me like the fan has worn out enough to where it can't start itself but with a little help it can get in the motion of thing....
But then again, i'm no A/C guy so i just want to make sure before i buy a new motor.
It's a Trane
model number: twg048a140b1
If you guys need any more information let me know, i'll take some pictures, whatever you need.
Also, anybody know where i could get a cheap blower motor? I just closed on the house on Friday so my funds are pretty low...still need A/C though.
Goodman Furnace2011-11-21 22:06:53A couple years ago I installed a new Goodman 95% two stage gas furnace and now it intermittently stops working. When it stops I get a pressure switch indicator light on the board, and I can hear a hum coming from the blower motor. If I had crank the blower motor to break the inertia I can get it going again, and it lasts several days, then the same thing. I am wondering if anyone can tell me if this is a common issue, and whether it is a blower motor or pressure switch issue. Thanks....
Trane XL80 blower motor part number?2012-01-10 03:32:00Thanks ahead of time for helping me if you can! I know I need to replace a dying blower motor in a 1992 Trane XL80 gas furnace. My main questions are:What is the part number for the blower motor and where can I buy it either online or in Indianapolis? (I ask since I assume I may not be able to buy from wholesalers since I am just a consumer.)
What is the part number for the blower motor capacitor?
Model number of Trane XL80 is TDD120R960A1. Serial #G29536108.
What motor is best? That is, are OEM motors available or would an 'equivalent' motor do just as well?
It is a high efficiency two stage Trane. The motor has 4 wires coming from it.
I have replaced blower motors in large broadcast transmitters so this looks fairly straightforward BUT I'm not one to assume. So that brings me to the next question:What 'gotchas' should I look out for?
How should I remove the 'squirrel cage'? Does that require a puller or just unscrew from the shaft?
It looks like all I have to do is remove the flu pipe, the circuit board assembly mount, blower motor mount assembly, etc. Am I missing anything else?
I know to be sure the breaker is off and I always carry an AC inductor 'glow stick' indicator as well as a meter plus grounding rod JUST to be extra careful. (I'd rather blow a breaker than me!)
Thanks again in advance!!...
HVAC New Blower motor, which speed?2011-11-25 16:37:29Hi, I just replaced the blower motor in my Trane HVAC/Heat pump unit. The old motor wouldnt turn on, even if I spun it with my hand. I bought a universal replacement (much cheaper and in stock), and it blows great now.
The question is, what speed should I use on the motor? It has high, medium, and low. I 'think' the old motor was on medium (as best I can tell by the wiring diagram).
Should I put the new motor on medium also?
I have it on high now, and it blows great, but it seemed to be a little slow in cooling down the house. Maybe I am asking alot for it to cool the house down from 90. It has been running for 2.5 hours and the temp is just now 83.
Also, it seems a little bit weird that the blower motor has several speeds, but the unit only uses one of them. Was it supposed to use all three? Trane model # TWE048P130A0
Thanks for any help! Ken...
Need help troubleshooting blower issue2011-12-11 16:57:28Amana blower Mod: BBC36A2A. Motor is not coming on, (2) circuit boards with Red LED. one board LED is indicating proper function. Second board LED has a dim flickering. Motor wiggles/jerks but will not start, spins freely with no power. Is this a motor issue or control board issue? What is the best way to troublshoot this problem?...
outdoor blower motor2013-07-06 20:42:33I have just installed a new blower motor on a condenser unit. after the installation the motor ran but not too full speed and then quit after 10 or 15 minutes of running. Is it possible the reason this is happening is because I have the line wires crossed? please help...
Bryant AC unit not working2011-10-28 19:32:40I have a Bryant 563C Split-System AC unit that stopped working. The thermostat and blower motor in the attic are working fine. After reading some of the threads I assumed it might be the capacitor. I visually inspected unit it does not have any signs of being bad. However there was a distinct buzzing coming from the Contactor. So my attension shifted to that. The Compressor and Fan motor will not kick on. I had my wife turn the thermostat off and the contactor buzzing of course stoped, when she turned it back on the contactor clicked on and buzzing began. The fan and compressor did not come on, however there was hissing coming from (again assuming), doing a lot of that , from somewhere around compressor. I immediately turned the power off to the unit. Any ideas?...
Using Condenser motor as blower..2011-11-03 21:58:00Hello folks,
I have a small emergency cos my blower motor packed up.
I have a spare condenser motor with the exact same ratings etc..
Can I use it for a day or so, until I get my hands on a replacement blower motor?
Thanks in advance...
Blower motor help2011-11-25 22:46:36Hey everyone,
I am pretty handy, but have never worked on a furnace so I am seeking assistance and knowledge.
I have a pretty old furnace and I am having difficulty with the blower motor. The motor will not turn on. It makes a humming noise and heats up when it is turned on. So by this it tells me the unit is getting power but is defective. Is that right?
Secondly, if I am going to replace it, where can I go to replace just the motor. It is a GE model # 3J522GXG 115v, 5.2a, 1/4HP, 1725 RPM. But I believe it was discontinued. Also to note this motor works on a belt system and is seperated from the main blower unlike most others I have seen.
Any suggestions or thoughts are greatly appreciated....
Blower motor: Emerson to GE2011-10-28 03:33:04Last night my AC stopped working. No air was coming out of the vents. Earlier in the night I had noticed a whining sound every once in a while emanating from my mechanical room. I have a lot of computers in the next room as well so I wasn't sure if the noise was coming from one of them or not. As I was listening more closely, a loud, final screech came from my furnace in the next room. I immediately turned off the AC at the thermostat and also tripped the breaker to OFF. I opened the furnace and removed the fan/motor unit. I tripped the breaker back to ON, turned the AC fan to ON at the thermostat, walked back downstairs and listened to the blower motor. The fan was not turning in the squirrel cage and the motor was making a humming sound. Figuring this was the source of my problem I went ahead and turned everything back off, removing power to the furnace and disassembled the fan/blower unit so that I could take the motor in for replacement this morning. I also replaced the capacitor. Everything seemingly went very smooth.
The old motor was an Emerson 3-speed K55HXJYZ-5490. The new motor is a GE 5KCP39FGM421 2-speed. I have no idea if this is the proper replacement, and I am beginning to wonder if the guy at the wholesale supply place does either. I can't get the new motor to power on. I replaced the capacitor first. From the new motor I:
- connected the brown and brown/white wires to the capacitor
- connected the black wire to the black feed from the furnace (same as with the Emerson)
- connected the white wire marked as 'LINE' on the GE wiring schematic to the red wire from the furnace (blue wire on Emerson was connected to this red wire)
- used a plastic cap to close the red wire from the GE motor (the red wire on the Emerson was also capped this way)
- connected the white wire from the furnace to the capacitor
After connecting all of the wiring I closed up the wiring box and put the blower/fan unit back in its housing at the bottom of my furnace. I tripped th......
Blower Motor location?2012-06-22 21:06:53I have a split A/C system, Carrier 8000 Weathermaker natural gas heater in the closet in the garage. I think the blower motor for the A/C is not working, where is the blower motor located? Thanks!...