Bryant 315AA furnace the blower is always on, no flame, 33 code

[alex4321]

I've got 19 year old Bryant furnace 315AAV060110. When I tried to turn it on a month ago the blower would not start. I replaced the control module  on my ECM 2.5 motor and it started working however the sequence was odd. The blower would turn on and run for a short period of time and shut off and the burner would start running. After 20 min of operations the blower was constantly on and so was the flame. I turned the furnace off and replaced control board with a used one that I got from ebay.  After  that my blower has been  always on and the  burner is off and Im getting 33 code. If I turned off the thermostat the blower is still running. I examined my old control board and found that the fuse was bad. After I replaced the fuse I replaced the new control board with the old one with the same result  the blower is always on and the burner does not work.

[NoDIY]

Without being onsite to check all the possibilities..

Have a look at this post here. It covers alot of things regarding code 33

https://www.technicalhotandcoldparts.com/hvac-repair-blog/how-to-fix-carrier-error-code-33-or-13-after-upgrading-to-a-higher-merv-rated-filter/#:~:text=Error%2033%20is%20a%20Limit,for%20more%20than%203%20minutes.

[Admin]

It's normal for the fan to run 90 seconds then stop before a call for heat on those models, and display a flash Code 12.

Check to make sure the other safeties haven't opened.  Some need to be reset manually.  I would hire a pro to look at that model if it's 19 years old.  A heat exchanger problem could cause the roll out switch to open, or they could call it a BVSS, blocked vent switch, on that model.  There is usually a reason that safety switch trips and it should not be reset without knowing why.