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    matt63634's Avatar
    matt63634 Posts: 4, Reputation: 1
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    #1

    Jan 4, 2009, 07:39 AM
    Intermittent Code 31 on Bryant Plus 90
    I have a Bryant 350MAV036080 furnace which sometimes gives me a 31 code on the LED. It will run fine for a few cycles then I'll hear the thermostat click for heat and the furnace won't run. I'll check the code and lo and behold, it's 31. If I leave it alone for about 15 min, it'll kick back on and run fine for a few more cycles.

    I've tried everything: cleaned the condensate trap and the hoses which lead to it, replaced the pressure switch, tested the condensate pump, replaced part of the vent PVC and I still can't get the unit to work 100% of the time. The vent PVC APPEARS to be clear outside. I live in a condo where it's hard to get to the actual pipe. I'm beginning to think it's the control board, does this sound like a symptom of a faulty board? Am I missing something else I should try? Thanks.
    taftsj's Avatar
    taftsj Posts: 4, Reputation: 1
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    #2

    Jan 4, 2009, 08:06 AM
    I had a 31 code on my Bryant plus 90 - repair guy found air switch not closing- ventor would not run. He put in conversion kit #325878-751 - now works fine!

    John in Stratford ON
    matt63634's Avatar
    matt63634 Posts: 4, Reputation: 1
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    #3

    Jan 4, 2009, 08:34 AM
    Quote Originally Posted by taftsj View Post
    I had a 31 code on my Bryant plus 90 - repair guy found air switch not closing- ventor would not run. He put in conversion kit #325878-751 - now works fine!

    John in Stratford ON
    Thanks. Was your furnace intermittent with code 31 or was it always not working?
    taftsj's Avatar
    taftsj Posts: 4, Reputation: 1
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    #4

    Jan 4, 2009, 08:45 AM
    It was intermittent at first and then it quit altogether.
    matt63634's Avatar
    matt63634 Posts: 4, Reputation: 1
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    #5

    Jan 4, 2009, 12:54 PM

    Okay, some success (I think). I took the cover off to the blower compartment where the circuit board is, and taped the kill switch down so it would run w/o the cover. After the thermostat clicked on for heat and nothing happened, I wiggled the wiring harness which connects the pressure switch to the circuit board - started right up. I think this is my problem. Now, is it the harness or the circuit board which is bad?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Jan 4, 2009, 01:14 PM
    Remove and replace the wire and connector a few times it might be corrosion
    taftsj's Avatar
    taftsj Posts: 4, Reputation: 1
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    #7

    Jan 4, 2009, 01:17 PM
    I don't know. My work order says "changed out integrated Bd." So I guess it was the board.

    John
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #8

    Jan 4, 2009, 01:27 PM
    I'll bet it is the pressure switch. Try this: next time the LED is displaying 31, nudge the wires where they connect to the p/s. If LED becomes steady, the switch is bad.
    matt63634's Avatar
    matt63634 Posts: 4, Reputation: 1
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    #9

    Jan 4, 2009, 01:28 PM

    Thanks. I've already replaced the pressure switch, and messed with the wires. I think it's fine.
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