Gas and Oil Home Heating Furnaces - Byrant pro 90 giving "31" code

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joej
02-17-05, 07:09 AM
I have a bryant pro 90 that is trowing 31 codes it will work all day then the last 2 nights it wouldnt kick back on took the cover off and blew out the internal air lines and got the burner to light again but last night the same thing happened. The error said to check intake & exaust airflow which is fine and check internal air lines wich I did any other suggestions on what to do?

Jay11J
02-17-05, 05:15 PM
Make sure there is no "sag" in the vent line for water to stand.

Also, make sure the drain line is free, water should flow freely.. Make sure the unit is level or water will not drain out of the secondary heat exchanger.. Standing water in the secondary heat exchanger will trip the switch as well.
LoveBoatCaptain
03-01-05, 03:20 PM
The code means to check the two pipes that go outside for blockage. One pipe takes air in and the other pipe takes exhaust out. If either are blocked they will impede an air switch from proving. Check to see if these two pipes are iced up outside. I once found a "Fart Bag" in one of the pipes, some kid could have turned the lights out on this young couple without even knowing it...