Bryant 90i furnace error code 24

Old 01-03-14, 01:54 PM
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Bryant 90i furnace error code 24

We have a Bryant 355mav050120. The furnace is about 10 years old and I installed a nest thermostat last year.

The furnace shut down over Thanksgiving weekend, throwing an error code. I had the unit serviced. The service tech indicated that he thought the problem was with the flame ignitor. Unit started back up and ran without issue for the past month.

We returned home from a trip last night and the unit was out of commission again, throwing a 24 error code.

Different tech from same company (fairly reputable) came today. He indicated that he thought the error code was incorrect and that he believed the real problem was a false code being thrown due to bearing failing, causing the motor to seize and throw the false code. He indicated that he was only able to get the unit functioning again after manually turning the motor until it kicked itself into gear.

Installer is recommending either replacement of the entire motor assembly (which he estimated to be $1300) or a new unit.

Curious for impressions of: (1) whether this diagnosis seems accurate; (2) if so, whether there are less expensive means to have the motor bearings replaced; or (3) whether you would recommend just replacing the entire furnace at this point in its life.
Old 01-03-14, 03:51 PM
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From another site I found the same problem that you seem to have and apparently there are a couple of things. It can be the motor or the head or possibly the board. Apparently big differences in price.

Last edited by spott; 01-03-14 at 04:19 PM.
Old 01-04-14, 01:24 PM
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I guess it is cold so you need to do something.

Do you have a manual for that furnace, or can find one online. It might tell you what to do. If the furnace is old it may have oil ports, which would allow you to add lubricating oil, I doubt it though.

You might be able to replace the motor yourself. If there is an HVAC parts place near you ask them what a new assembly costs. Or just a new motor.

On my home furnace from the 1990s it is fairly easy to disassemble.

Sometimes repairmen are willing to work off the books for a lot less but without much guarantee beyond their word.
Old 01-04-14, 02:00 PM
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That is really strange..... a trouble code 24 is shorted wiring or blown fuse. If the fuse was blown you wouldn't get any codes so the tech was right in that the code doesn't appear accurate..... although when you look in the troubleshooting guide it talks about the variable speed blower control.

The blower motor does not have oil ports..... it's considered non serviceable.
The furnace is a multistage, condensing model with ECM variable speed blower. It's going to be costly to replace that blower motor.

troubleshooting tech service manual

Fxpedio carrier groups public documents techlit 355m

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