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Old 02-24-2012, 12:42 PM   #1
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Bryant 311AAZ036070 Limit Switch Problem


I have a problem with my Bryant 80 plus furnace. The furnace would only turn on for a few minutes, then shut down and give me error code 33. This code list a number of things it could be so I eliminated most of them, including replacing the flame sensor and the blower. Immediately I tried the cheap replacement of the flame sensor, didn't work. Then I noticed blower would only work on low, so I left it running on low for some heat, but then it totally gave out, causing the upper limit switch to melt. So when I replaced the blower, I jumped the upper limit to see if it would work, and it does. But when I replaced the upper limit switch, it cuts the furnace off just like it did before.

Any suggestions from here?

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Old 02-24-2012, 12:49 PM   #2
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Bryant 311AAZ036070 Limit Switch Problem


upper limit, the one above the burners with a small diode attached to it on some models? is that what you changed? check across the diode AND limit switch with an ohm meter and see if one of them is faulty.

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Old 02-24-2012, 12:56 PM   #3
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Bryant 311AAZ036070 Limit Switch Problem


Yes, I replaced the limit switch above the burners..with a brand new part. Are you thinking that the new switch could be faulty?
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Old 02-24-2012, 04:13 PM   #4
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Bryant 311AAZ036070 Limit Switch Problem


It sounds like both limit switches were doing their job of shutting down the furnace after a few minutes of run time.
Dirty air filters? dirty a/c coil? covered return air grill? Too many heat registers shut off? etc...
Have you considered doing a temp rise on the furnace and comparing that with the temp rise on the furnace rating plate to see if the furnace is really overheating??
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Old 02-24-2012, 04:16 PM   #5
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Bryant 311AAZ036070 Limit Switch Problem


Quote:
Originally Posted by coleary61385 View Post
Yes, I replaced the limit switch above the burners..with a brand new part. Are you thinking that the new switch could be faulty?
Yep......
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Old 02-24-2012, 05:01 PM   #6
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Bryant 311AAZ036070 Limit Switch Problem


Check the new blower motor to make sure it's rotating the correct direction. If that's good increase to a higher speed. Safe to assume you replaced the capacitor along with the motor?

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