A member "T-Top" asked a question to another poster that was having a similar problem yet he never responded to T-Tops question. So lets see if this can get an answer, I have a Bryant Plus 80 that keeps cycling code 33.

T-Tops question was 'Does the furnace stay ignited with the blower door off and my response for my issue would a definite YES. As soon as I put door back on the problem starts again. We had a little snow yesterday (4 inches), the problem started after the snow, not sure this is important, but trying to state as much as I can.

I am running into the same problem he had and the only way I found to keep the heat ignited was to leave the blower door off, yet even though it was running, the house struggled to get warm (ie. Thermostat was set to 72, with the door off it would stay around 65. When I put the door back on the problem would bounce back and forth (heat / no heat but fan kept running resulting in cold air). Fan is set to 'Auto' at thermostat. I have taken out the flame sensor (?? ) and cleaned with brillo pad and replaced did not seem to make a difference still have the same problem. When the heat was on (flames active) I tested all of the switches for voltage and all read fine. Please tell me what you think since the system seems to run fine with door off, yet does not heat completely, which is logical since the cold air in the garage is being sucked in. My main concerns are of course the temp since I have a 5 & 4 year old, second the thought of next months Gas and Electric bill since it seems the system is running constantly. Any help you could provide would be great.

Thanks,

Jason