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Old 09-30-2011, 06:34 PM   #31
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Carrier 58MVP Blower Problem


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Originally Posted by ColoradoDave View Post
I had the dreaded 44 / 41 blower problem on my 58MVP with the motor not spinning after the filter clogged too much..
Also, Is there a way to jumper around the speed detection circuitry to get the A/C back up in the meantime ?

Dave, I had simillar problem without trimister change, where motor wiggles up & back words few times. AC compressor is working fine & freezup the lines but the blower motor is not coming on.
I had spare another blower motor never used on craigslist I had bought. So I hooked up that, this one did the same wiggling. Now while I went to turn off the thermostat it had a small short noice, I came back to see it all I can smell is little smell but nothing else.
I did open the old blower motor ECM and transmister is in good condition doesnt look burned.
Any luck on your problem come back, I called tech spend an hr, called carrier, he was told motor or ECM, so I am still hanging on for a life saver. This unit was only used 2 years. My Carrier Air handler Model no is FK4CNB006 motor is 3/4hp


Last edited by ACfromCa; 09-30-2011 at 06:37 PM. Reason: adding model no
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Old 09-30-2011, 06:45 PM   #32
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Carrier 58MVP Blower Problem


You can do this test.

http://img824.imageshack.us/img824/5958/modulej.jpg
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Carrier 58MVP Blower Problem-module.jpg  
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**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.

Last edited by JJboy; 09-30-2011 at 06:50 PM.
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Old 06-19-2012, 06:13 PM   #33
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Carrier 58MVP Blower Problem


Armed with a SL22 and a sodering iron I have beet back the Money Demons!
Thank you all who have tirelessly given and given information, great photos, and even Videos to help people.

My Carrier unit is blowing ounce again!
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Old 06-19-2012, 06:15 PM   #34
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Carrier 58MVP Blower Problem


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**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.
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Old 11-27-2012, 08:32 PM   #35
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Carrier 58MVP Blower Problem


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Originally Posted by bob reynolds View Post
These high efficiency variable speed blower motors are maufactured by GE. They are used in many brands including Lennox, Carrier, Bryant, Payne, York and Trane.

There are two parts to the blower motor.

The two parts are the motor itself and the ECM module that is attached to the blower motor. The ECM looks like a black hubcab and it is attached, to the motor, with two long bolts.

You can remove the ECM module by simply unscrewing the two long bolts. You do not have to remove the blower motor from the mounting.

The motors in different series and brands are often the same. The difference is the ECM module. The ECM module must be matched up exactly or it will not work.

What usually fails on these high efficiency units is the ECM module. A service truck can not possibly carry all of the hundreds of ECM modules that are used in the various brands and series of brands.

However, the part that often fails in the ECM unit is part number SG379 which is a black disc about the size of a quarter in the center of the ECM.

You can look at the SG379 disk and often tell it has failed without any further checking. The disk will often be broken, brittle or disconnected from the circuit board, and there will be an obvious spot on the circuit board that has received a lot of heat. As long as the board is not broken, or deformed and the traces are in place, then this componet can be replaced. This component is designed to take a lot of heat and the circuit board will be discolored from the heat. This is normal and this is common.

This propierity part is a thermistor and it is used for surge protection as well as regulating the current to the motor.

SG379 has a finite life and like a light bulb it gets weaker and weaker until it finally just fails.

Although not available from GE or any or the HVAC companies, a SG379 part substitute, manufactured to OEM standards, is available from amazingkeys.com and can be soldered into the ECM circuit board in about 5 minutes.

If you are a serviceman, you can keep a few of these parts on your service truck and have the unit up and running in one service call and not have to replace the motor or the ECM. This also saves the customer a $1500 blower motor replacement or an ECM replacement.
I took off my ECM module and everything looked fine. Now what?
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Old 01-13-2013, 05:39 PM   #36
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Carrier 58MVP Blower Problem


Thx Bob Reynolds! I am in the middle of my thermistor repair, but have definitively found my issue. See this thread, posts 25 and 26....I'll update that thread mid week...including pictures.

variable speed trane blower motor
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Old 01-25-2013, 06:58 PM   #37
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Carrier 58MVP Blower Problem


My ECM module on my Carrier 58 MVP took a dump today as well.

Unfortunately I was under the gun, and didn't want to start guessing so I called my Local HVAC guy, since my furance is in the attic, and hard to work on.

Between him and I we were able to pull the blower ASM in about an 1.5 hours, pulled the ECM module, saw the burnt disc. Luckily he had the module at his shop close by. Swapped it in and back up in running.

If it hadn't been 58 in the house already, and 14F outside, I would of gone the DIY route.

Oh well, next time! Good thread.
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Old 01-26-2013, 07:56 PM   #38
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Carrier 58MVP Blower Problem


Indeed the thermistor replacement fixed me up! I'll try to get pictures up as well later. First attempt didn't get enough solder to wick through the thermistor to the other side. Unit went out 48 hrs later because of poor connection.

I found I could pull the motor module out with it all mounted in just 2 min. Resoldered another new thermistor in and good to go since.
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Old 09-06-2013, 01:27 PM   #39
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Carrier 58MVP Blower Problem


I have a carrier model 58mvp. The blower stopped working and I did a code check and got codes 41 & 44. After looking at some chats here I seen that it could be the thermistor. I have removed the blower and the motor
(GE CB02 09Cb ) no other makings on the motor. I looked at the thermistor and it is burned.

Here is where I am running into trouble I have a model SG349 and can not find a replacement, been looking on line for 2 hours.

is the a similar one that can be used?

I may not be correct on this but I think mine is 1 OHM/ 30 Amp but not 100% sure.

Any and all help to get this fixed will be greatly appreciated. It is suppose to get hot again middle of next week. I can take the heat more worried for my special needs dogs.

Thanks

Mark
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Old 09-06-2013, 02:16 PM   #40
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Carrier 58MVP Blower Problem


http://www.amazingkeys.com/product/s...thermistor-oem

http://www.sears.com/amazing-keys-in...REDIRECT=false
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Old 09-06-2013, 04:42 PM   #41
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Carrier 58MVP Blower Problem




Thanks!!!!!!!
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Old 06-23-2014, 06:27 PM   #42
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Carrier 58MVP Blower Problem


I wanted to find out if the issue I am having is related to the thermistor. I am under the impression the blower would not fire up at all if the thermistor or ECU were the issue?

The symptons I am having are every now and then with no rhyme or reason, my blower will not fire up when the thermostat calls for it to. The outside unit will be running but no air is being blow out the vents. I will reset the unit in the attic by pulling the breaker and popping it back in and that will usually get it going (sometimes takes a few tries). Any idea?
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Old 06-24-2014, 04:38 AM   #43
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Carrier 58MVP Blower Problem


That would not be a thermistor problem. Look for the error code.

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