P43 -- Knobs quite working

bnther44 Posted By bnther44, Feb 10, 2019 at 10:54 AM

  1. bnther44

    bnther44
    Member 2.
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    Dec 17, 2014
    38
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    Loc:
    Kalamazoo
    I've got a Harman P43 and it is my main heat source. The stove is just over 3 years old and my temp. knob has quit working. The stove runs, but it will not turn up or down. The blower knob works fine, just no way to adjust the flame. I only operate the stove in manual mode.

    Has anyone else had this problem?
     
  2. bob bare

    bob bare
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    Oct 31, 2013
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    park county montana
    Does the knob refuse to turn?
     
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  3. bnther44

    bnther44
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    Dec 17, 2014
    38
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    Loc:
    Kalamazoo
    Thanks for the response.

    The knob turns, but doesn't do anything. The fire stays at what looks to be simmer (50 on the dial) regardless of how high I crank it up.
     
  4. bas157

    bas157
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    Oct 1, 2012
    101
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    Loc:
    Near Limerick, PA
    I don't have an answer for you but sometimes mine won't turn off so may have the same root cause as yours. On mine, I turn the knob to off and it just keeps feeding pellets. I open the hopper lid, let it burn down then it won't feed anymore once it burned down enough.
    Same general issue of a know not working all the time. Hoping someone has some solutions for you that might work for me too!
     
  5. Bill Pitman

    Bill Pitman
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    Mar 17, 2018
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    Loc:
    Milford, Pa.
    Does the auger feed pellet
    Did it just start doing this?
    Does the auger feed pellets?
    Is the combustion blower working?

    With feed adjustment knob turned to " test" position- do the blowers & auger work?

    Could be vacuum switch is bad. The vacuum switch is normally closed, allowing the stove to function correctly. That is why the auger stops if you open the door to clean ashes from burnpot.
    The vacuum switch will open at -.17" of wc.

    Could also be a bad esp probe, located in the exhaust. This should be kept clean, as it is the main most important input to the control board.

    Keep us posted,

    Bill Pitman
     
  6. bob bare

    bob bare
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    Oct 31, 2013
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    Dirty stove,pile of ash in front of exhaust sensor,restricted flue or intake,bad exhaust sensor,bad potentiometer on control board.Also,may want to try unplugging stove for 5 minutes.
     
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  7. bnther44

    bnther44
    Member 2.
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    Dec 17, 2014
    38
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    Loc:
    Kalamazoo
    Yes
    Yes
    Yes

    Everything seems normal, except that it doesn't 'turn up'. The temperature knob seems to be irrelevant -- with regards to operation. I'm reluctant to turn it off for fear that it won't turn back on.
     
  8. bnther44

    bnther44
    Member 2.
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    Dec 17, 2014
    38
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    Loc:
    Kalamazoo
    I'll double check on the ash, but I did a quick clean just recently. The exhaust goes out the side of the house and not into a chimney, so I don't think there's any restriction, but I'll definitely check.

    I'll also try unplugging it for 5 minutes...when I see there is a break in the cold.

    Thank so much for the replies.
     
    bob bare likes this.
  9. bnther44

    bnther44
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    Dec 17, 2014
    38
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    Loc:
    Kalamazoo
    Just a quick update.

    I was able to shut the stove down and then unplugged it for 10 minutes. It's been working fine now for over a week.

    Don't ask me...cause I don't know 'why?' All I care is that it's working now.

    Thanks for all the replies
     
  10. greg13

    greg13
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    Jan 5, 2012
    902
    273
    Loc:
    CNY
    Any blinking lights on the control board?
    Temperature Sensor wire come unplugged?
     
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