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Code #33 on Bryant 355MAV 90i Furnace

Have been getting a code #33 on my Bryant 355MAV 100k btu furnace, Evolution controls (installed new 2006) every heating season for three years since we built the house. Installers solution was to turn down gas pressures (lp) which, while allowing the furnace to run, ultimately led to heat exchanger clogging (soot)and replacement (parts covered under warranty, labor $1,500 not covered). Control Board and personality plug also replaced. Now back to the same code #33, just replaced fan limit switch with same OEM model limit switch - same problem. Furnace will run fine if I jumper fan limit lead wires. Otherwise, I have to go down and turn breaker switch off then on again to clear the code 5-6 times per day. Output temp at top of plenum is 120 deg, return air 64 deg. Limit is not suppossed to trip until 180 deg! Return clean, new 30 day filter (not HEPA), 2 returns, one each side of return cabinet, one 14" and one 20". Installer is now out of business and I have been through 2 other service companies. Bryant has been very little help, other than covering parts under warranty - they just keep suggesting other parts to replace.
Any help appreciated.

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  • jeepfamily1 Mar 01, 2009

    Thank you for your response. The LP conversion kit was installed originally (LP stickers present on gas valve) and the orifices were changed out again with the correct LP orifices by the first svc co just to be sure. I tried to include as much info as I could in the initial post. I have checked static press. (using the Evolution control) on both high and low fire: Low: CFM = 1097, Blower RPM = 608, Static Press 0.11 High: CFM = 1520, Blower RPM = 868, Static Press = 0.27.

    2 zones, both Airflow limits set to MAX, all registers open full, No Dehumid installed, but Dehumid set to High (to increase airflow). New, low resist 30 day filters installed in both returns.


  • jeepfamily1 Mar 08, 2009


    After many phone calls to customer service, Bryant has reviewed our case and agreed to replace the furnace with a newer model (3-stage 355CAV 95S) at no charge. It was installed Friday and so far has been working like the first one should have. One note, the new 3-stage furnaces require a new Evolution thermostat to fully utilize the 3 stage abilities of the furnace (low med hi). Bryant has agreed to replace our original 2-zone Evolution thermostat controller as well, since they suggested the 3 stage furnace as a replacement.

    All told, we have spent over 40 hours and $2,000 getting this resolved, but now that we are warm again - what else can we say?

    Be persistant and don't let the manufacturer off the hook.


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'Limit or flame rollout switch is open'. In my case, the flame rollout switch had tripped due to an overheating? I had to push the button between the wire leads to reset the switch. Then when I turned the power back on, the furnace started up like normal.

Why did the switch overheat and trip? My current theory is that there was a rubber grommet around a pipe near the switch that had slid down and was no longer sealing the furnace?

Posted on Dec 21, 2009

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Evaporater coil condensation with air on unit 14 years old 90i forced air

Posted on Aug 04, 2009

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Make sure the unit is properly set up (jetted/orifices) for LP. It sounds to me like the unit is setup for natural gas and is being used on propane.

Posted on Mar 01, 2009

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