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Harman P61-2 Circuit Board comes alive when mode knob is set to off?

Post in 'The Pellet Mill - Pellet and Multifuel Stoves' started by Don2222, Dec 23, 2013.

  1. Don2222

    Don2222 Minister of Fire

    Joined:
    Feb 1, 2010
    Messages:
    7,489
    Loc:
    Salem NH
    Hello

    Has anyone heard the combustion fan go on and off along with the LED when the stove is set to off?
    The Status light also goes on and off! @##@@##!!

    This is a manual light P61-2 stove with the recessed ash door.

    Kinda SPOOKY!

    See video
    Last edited: Dec 23, 2013

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  2. jackman

    jackman Burning Hunk

    Joined:
    Jan 15, 2013
    Messages:
    173
    Loc:
    Oregon
    Yep. It's a common problem with the potentiometers on the Harman board. I replaced the pots on my board over the summer which solved the problem. It's a $10 part available on ebay if you know how to desolder/solder a printed circuit board. Otherwise it's a board replacement which costs alot more.

    You might want to try using a can of air and blowing it out. You may get lucky but the problem will likely return.
  3. Don2222

    Don2222 Minister of Fire

    Joined:
    Feb 1, 2010
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    7,489
    Loc:
    Salem NH
    Thanks, that is good to know. The stove has the burn pot with the bolts to hold the ignitor cradle and the Yellow and blue Ignitor wires, so upgrading to an automatic board makes it easier to convert it to auto light in the future.
  4. dhall28

    dhall28 Burning Hunk

    Joined:
    Mar 2, 2013
    Messages:
    182
    Loc:
    Central Ohio
    I agree the only two things that I can think of that would do that is a bad pot. or the esp/board reading of the esp. even in the off position is the esp read over 90 degrees F the combustion fan will come on. if you had the Harman board reading tool you could watch what the board "thought" was going on
  5. Don2222

    Don2222 Minister of Fire

    Joined:
    Feb 1, 2010
    Messages:
    7,489
    Loc:
    Salem NH
    Yes, I agree, the stove was stone cold so it could not have been over 90 Degrees. I pulled the ESP probe and it was covered with corrosion, so I pulled out the wire wheel and got it shinny clean. That actually helped alot because the room fan was going on and off too before I did that!

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