P43 out of control

  • Active since 1995, Hearth.com is THE place on the internet for free information and advice about wood stoves, pellet stoves and other energy saving equipment.

    We strive to provide opinions, articles, discussions and history related to Hearth Products and in a more general sense, energy issues.

    We promote the EFFICIENT, RESPONSIBLE, CLEAN and SAFE use of all fuels, whether renewable or fossil.

gutlo

Member
Feb 22, 2009
184
eastern connecticut
I have a 9 year old Harman P43. It has performed flawlessly ( except it won't self ignite).
Today, it started to burn very hot. I had it on stove temp, with Constant Temp on minimum setting and feed limit on minimum. It fed pellets as if at maximum+ and the flame was leaping up very high. The bottom part of the flame was blue.

I switched to room temp, 70 degrees, with the same results.

I had cleaned it a week ago. I poked the burn pot holes again, found a few jammed ones, stated it again, same results.

OAK is installed, flapper is open.

I need some help figuring out what's going on. Thanks to all who reply.
 

rickwai

Minister of Fire
Nov 1, 2011
1,313
ohio
Sounds like a esp or board issue. Replace esp, if that dont fix it replace board. I always replace the esp when replacing a board.
 
  • Like
Reactions: Mt Bob

Mt Bob

Minister of Fire
Oct 31, 2013
3,953
park county montana
In my experience, a dirty ESP causes long shutdown time, longer time for convection fan to come on, slow reaction to room and stove temp settings. More likely it was damaged during the cleaning, But, you can try cleaning the control pots. If you have no contact cleaner, turn all of them back and forth 5 or six times, adjust ant start stove, see what happens.
 
  • Like
Reactions: Washed-Up

gutlo

Member
Feb 22, 2009
184
eastern connecticut
Bob,
Did I mention that I have never removed and cleaned said ESP? I rigged up a brush with a long handle and brush off the probe from the inside every time I do a major cleaning (3 times a year). Could I have built up a coating of crude that insulated the probe? This would cause it to send a signal to the control board that it is cold when it isn't.
 

Mt Bob

Minister of Fire
Oct 31, 2013
3,953
park county montana
I never remove mine. A soft boiler brush does just fine, from inside the stove. Before that,I uses a normal flue brush, just don't ram or yank. Yours may have just died, or your control board has died.
 

Tonyray

Minister of Fire
agree with using a bristle brush to gently clean the ESP..
8yrs and never removed it..
doesn't have to be factory shiny to work correct...
 
  • Like
Reactions: Mt Bob

Tonyray

Minister of Fire
Thanks, Tonyray. for the confirmation. I thought that I was being negligent by not taking out the ESP and cleaning it.
Yes. They either work or dont work. No partial working even when dirty. Its just ash that coats it.