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Old 12-13-2009, 07:36 AM   #16
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Bryant 355MAV furnace and A/C blower not starting


I had the same problem this morning at 05:30. We woke up to a 60 degree house and no blower motor. I did a quick search and found this thread. The issue was the condensation pan was not draining properly. I emptied the pan and unclogged the line. Blowers on, and we're on out way back to a warm house.

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Old 01-05-2010, 09:36 AM   #17
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Bryant 355MAV furnace and A/C blower not starting


Quote:
Originally Posted by rajar2 View Post
Similar problem to another Bryant 355MAV owner.
I hope someone can send me the Bryant check out procedures for a troubleshooting a blower motor that does not start.

"Code 41 is the blower motor failed a test and is outside itís speed range by 10 percent.. Itís got 25 steps.?" Can anybody email me these procedures?
Both my furnace and A/C begin to go through their initial start-up cycles and completes everything OK, gas comes on and lights fine up to when the main blower motor should come on, but it does not start to turn at all - never. At this point the furnace shuts down. Similar results when I start the A/C.
I have the Installation manual and have checked the error message from performing the Component test. Inducer motor starts on Low speed, then Hi-speed, then hot surface ignitor lights up the gas and is on for 20 seconds, then it dies. The blower does not start its low, then high speed cycles. The Fault code is #41 - I get 4 flashes on Green LED followed by 1 on Yellow LED. This sequence keeps repeating. FU1 fuse on the panel is OK and am still looking for FU2. Any ideas?
Donít know why no one noticed this but the code would be 14 NOT 41
The yellow light is the first digit and the green light is the second digit.
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Old 01-05-2010, 09:50 AM   #18
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Bryant 355MAV furnace and A/C blower not starting


Take a look at this thread:

Bryant 355MAV furnace and A/C blower not starting

It sounds like your motor thermistor has gone away.

Good luck!
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Old 05-31-2010, 08:29 AM   #19
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Bryant 355MAV furnace and A/C blower not starting


Its been a long time since I played with any circuit design but after looking at this thermister issue it appears Bryant/carrier is using this thermister to slowly ramp up the fan motor over a few seconds to prevent sudden onslot of noise, I know thermistors are also used to manage startup surge for componant protecting but that doesnt seeem to be the case here, my question is can I bypass/jump this SG348 thermistor for a couple of days till the new one comes in?
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Old 05-31-2010, 11:38 AM   #20
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Bryant 355MAV furnace and A/C blower not starting


Hi Hartzog86,

I believe that the thermistor manages the inrush current to the motor. As it heats up from motor current passing through it, its resistance drops to almost zero. The motor is a very expensive component (~$700). Unless you are willing to take the chance that you could wreck the motor I would get out the blankets until the new part comes in.

If you're doing this today you should have the part by Wednesday latest, and it might be available locally tomorrow.

Good luck!
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Old 05-31-2010, 04:51 PM   #21
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Bryant 355MAV furnace and A/C blower not starting


Thanks Todd for your reply, thats what I am doing, I ordered a couple and even paid for next day shipping ($42 shipping on a $4 part) just dont know if I can stand the wife's nagging about not having AC till it gets repaired and was hoping a jumped then continuously run fan would be reasonably safe, I think it would be but was wanting someone with actual vs thearetical experiance to weigh in. Then if it blows up I can tell her it was not my idea

Zog
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Old 05-31-2010, 06:37 PM   #22
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Bryant 355MAV furnace and A/C blower not starting


Good luck, Zog--didn't realize you need A/C, where we live (NW) we don't. I think I paid something similar to overnight the part, but was glad to to get it at all. I ordered a spare, too--from reading the posts I suspect that the part lives 5-7 years, then dies. I ordered an uprated part (30a instead of 20a) to maybe make this a one-time repair.

Your wife can blame me--mine does all the time.

Stay cool,
Todd
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Old 06-03-2010, 07:44 PM   #23
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Bryant 355MAV furnace and A/C blower not starting


Fan-current limiter-SG-349 update

Found one at Digi-Key corp www.digikey.com (1 ohm 30amp) part #570-101059-ND Current Limiter inrush (Thermister) for $2.64 each (ordered a couple) overnite $21 shipping, $26.28 total. 1hr to remove and replace fan, 15 minutes to R&R thermister. Worked perfectly first time.

Estimated repair from two local companies were within $15 of each other- $865

saved $839 Not to mention the brownie points earned from the ol' lady

DIY to the rescue again.....

Last edited by hartzog86; 06-03-2010 at 07:47 PM. Reason: spelling
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Old 06-06-2010, 12:22 AM   #24
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Bryant 355MAV furnace and A/C blower not starting


Thermistor is black disc (standing on edge) in center of photo

Last edited by hartzog86; 06-06-2010 at 12:30 AM. Reason: Added photo
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Old 06-06-2010, 07:12 AM   #25
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Bryant 355MAV furnace and A/C blower not starting


There are 3 LARGE capacitors in those motors and GE recommends you wait 1/2 hr B4 doing any work on that module so they self discharge. These are BIG ones and can seriously hurt you.
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Old 08-20-2010, 02:49 PM   #26
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Bryant 355MAV furnace and A/C blower not starting


I got a Bryant Plus 90i AC/furnace and our AC went down due to the blower not kicking on 2 weeks ago yesterday and the gas company service man who has been on the job for about 20 years is stumped and is working as I post this. The code said the blower motor was the problem so he replaced the motor, nothing. He then replaced the control head on the motor, nothing. He then replaced the control module that goes to the motor twice just in case and nothing. He replaced the wiring harness from the control circuit board to the motor and still nothing. Luckily this is a small town and he is trying to find out what the problem is and said he is going to treat us right on all the time and parts. He will only charge for the part needed but hasn't been able to locate the source. It was put in in 2002 so it's only 8 years old. Heck he went to their office and robbed all the guts out of theirs today just to get it going at least for the weekend, it's supposed to be close to 100! He is at lunch right now but he said the Bryant tech he has been talking to on the phone don't know what else to try. Any info would be greatly appreciated thanks.
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Old 09-20-2010, 09:31 PM   #27
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Bryant 355MAV furnace and A/C blower not starting


Hi:
I have a Bryant 90i 350 mav condensing furnace that has a similar problem to the units discussed above. It starts up ok but fails
to go from low heat to hi heat. Components test = ok, pressure switch test = ok. No codes showing possible component failure.
Any ideas to check out? Is it possible to clean out condensate trap? How do you do this?
Any way to determine if gas valve is at fault?
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Old 04-08-2011, 12:32 PM   #28
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Bryant 355MAV furnace and A/C blower not starting


I had the same issue with the blower motor on my Bryant 355MAV and was able to resolve it with the replacement of the thermistor as explained in this thread.
This board was a huge help...Thanks!

I had been noticing an occasional rumble when the furnace fan was innitially starting up and had investigated all the mechanical possibilities with no luck. The burned thermistor helped point in the direction of a potential solution for the rumble.
When testing the new thermistor I had the cover off the furnace and was watching the blower motor. On one startup I heard the rumble and noticed that the blower was trying to run but was just sort of vibrating in position like it wanted to start spinning but could not begin rotating. The motor was able to start without faulting the control. I was told that is may be failing capacitors in the motor controller circuit.
Has anyone else noticed this vibration? Is there a solution out there for the start up harmonic?

Thanks
Steve
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Old 02-16-2012, 10:07 PM   #29
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Bryant 355MAV furnace and A/C blower not starting


toddshelton,

Thank you very much for posting your information. It turned a 1,600$ repair into a 160$ repair. When our furnace motor broke and we got price from BELAIR we were devastating (we have 4 children and my husband salary was cut to 50% less), so I did some research if there would a way to save the motor and replace only the broken resistor. Nobody from my family believed that easy and cheap solution could work. Description in your post was very convincing for me , I did everything what you suggested and VICTORY , our Furnace works again(good because outside is cold !).Great Job ! Thanks a lot ! Anna
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Old 06-18-2012, 08:52 PM   #30
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Bryant 355MAV furnace and A/C blower not starting


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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