Harmon XXV replaced combustion blower now it wont shut off

Dave22 Posted By Dave22, Apr 8, 2018 at 6:27 PM

  1. Dave22

    Dave22
    New Member 2.
    NULL
    

    Apr 8, 2018
    6
    0
    Loc:
    United States
    Hello,
    I have an older Harmon XXV (chain drive) and the combustion blower failed the other day. I purchased a new one from a local dealer (OEM) newer model (no rear fan blade). I have it installed and working but it doesn't shut off. it continues to run even when the stove is cool or the dial is set to off.
    I am not getting any status error code (blinking lights). I have cleaned everything and tried disconnecting the ESP to make sure the status light would register an error, and it did.

    Any help or suggestion will be greatly appreciated.

    Thank you
     
  2. Overfireinthehole

    Overfireinthehole
    Member 2.
    NULL
    

    May 5, 2017
    177
    47
    Loc:
    Miller MO
    A few things can cause your combustion blower to run non stop. Incorrect dipswitch settings, a vacuum switch not staying closed because of a clog or leak somewhere and I’ve also seen them do this after a power surge if they board took a hit in that relay. I’d start out by making sure you didn’t break some crud loose that’s clogging it up while replacing the blower and I’d also make sure your blower is mounted tight.
     
  3. Dave22

    Dave22
    New Member 2.
    NULL
    

    Apr 8, 2018
    6
    0
    Loc:
    United States
    Thank you for your reply.
    When you say "crud loose that’s clogging it up" Are you referring to the pressure switch?

    I wonder where this motor is a newer version (higher amp rating) if a dip switch needs to be set differently.
    I have double check and removed and reinstalled the blower to make sure it is in tight. I read in the manual that the armature needs to point up. I'm not sure why that is but I can try that.
    Do you know if I disconnect the pressure switch and jump it can I test it that way?

    Thanks again
     
  4. Overfireinthehole

    Overfireinthehole
    Member 2.
    NULL
    

    May 5, 2017
    177
    47
    Loc:
    Miller MO
    Yes the pressure switch can be jumped to tell you if that’s your issue. The change in dipswitch settings has nothing to do with what blower you have. here’s the dipswitch settings for the new boards. I’d have to see your board to kno if it’s the old style
     

    Attached Files:

  5. Dave22

    Dave22
    New Member 2.
    NULL
    

    Apr 8, 2018
    6
    0
    Loc:
    United States
    Thank again for your help. I tried to unplug the pressure switch (both leads) and with the stove temp dial set to off, the room temp dial set to 55 the lowest setting. I plugged in the stove and the fan came on. the only light on the panel is the power light. I shut the stove down and jumped the pressure switch leads and plugged the stove back in and the fan came on again. the only light is still the power light.

    I attached pictures of the circuit board and a close up of the dip switch
    . 20180409_171247.jpg 20180409_171151.jpg 20180409_171303.jpg
     
  6. Overfireinthehole

    Overfireinthehole
    Member 2.
    NULL
    

    May 5, 2017
    177
    47
    Loc:
    Miller MO
    There’s something on thos boards that blows and causes it to run nonstop. Only solution I know is a new board.
     
  7. Dave22

    Dave22
    New Member 2.
    NULL
    

    Apr 8, 2018
    6
    0
    Loc:
    United States
    I was hoping that wasn't going to be the solution.


    Thank you
    Have a great day.
     
  8. gfreek

    gfreek
    Minister of Fire 2.
    NULL
    

    Nov 5, 2010
    1,099
    129
    Loc:
    Beautiful Attica/Varysburg,New York
    Could a bad ESP cause this ? I wonder if unplugging it from the board would give an answer.. Sorry,
    Re-read original post and already tried unplugging ESP..
     
  9. rickwai

    rickwai
    Minister of Fire 2.
    NULL
    

    Nov 1, 2011
    555
    119
    Loc:
    ohio
    Does auger turn when you put into test mode? If it does not then it is a vac switch is not closing
     
  10. Dave22

    Dave22
    New Member 2.
    NULL
    

    Apr 8, 2018
    6
    0
    Loc:
    United States
    Thank you for the Info. The auger does turn in test mode.
     
  11. rickwai

    rickwai
    Minister of Fire 2.
    NULL
    

    Nov 1, 2011
    555
    119
    Loc:
    ohio
    then you have a esp or board issue. If you get a esp you can unplug old one and plug new one in before installing to verify. Also play with the knob and see what happens. I have seen where the knob is worn out and there is only a small spot in the middle where it will shut off. Is the comb blower light illuminated even when knob is off and stove cold?
     
  12. Dave22

    Dave22
    New Member 2.
    NULL
    

    Apr 8, 2018
    6
    0
    Loc:
    United States

    The lights come on while the stove is running but after temp is met or if the stove is shut off all lights except power go out. The blower just keeps running unless stove is unplugged.
    I ordered a new red esp and board ver E last night. ESP was on sale and I found a 15% off coupon so I figured that was a sign to just replace both. The parts will be a week or so getting here, but I'll post after I have them installed to let you know how it went.
    Thanks to all for your help
     
  13. Overfireinthehole

    Overfireinthehole
    Member 2.
    NULL
    

    May 5, 2017
    177
    47
    Loc:
    Miller MO
    Keep your old esp as a spare
     

Share This Page