Harman P68 weak flame

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gunslinger1919

New Member
Nov 13, 2020
7
MD
New to the group searching around for some answers my Harman P68 after an extensive cleaning has a weak flame and will not increase. It basically burns all the pellets out of the pot and will not feed anymore. I replaced several items as well, the esp probe, vacuum pressure switch and igniter. Pellets are lignetics gold. Also door seal is new and i just ordered a bottom seal only other thing i can think of. Only dealer/service is getting 80 calls a day and has like one tech making service calls.
 

jackman

Minister of Fire
Jan 15, 2013
638
Oregon
Before anything else I'd try a few bags of a different brand of pellets.
 

gfreek

Minister of Fire
Nov 5, 2010
1,422
Attica,,New York
Did you bypass the vacuum switch by connecting the 2 wires together..?? Shut it down and unplug it first..
 

gunslinger1919

New Member
Nov 13, 2020
7
MD
I did by pass the switch and the ignitor never came on... I took the ignitor out and ran the wires again and sealed up the grommet. I plugged the wires into the vacuum switch normal and got the weak flame this time. Before it was not lighting now a weak flame. Machine was unplugged and reset as well. Ill try again tomorrow as I am working tonight. I have some statesman pellets I can run but never really had and problems out of lignetics gold.
 

SciGuy

Feeling the Heat
Aug 17, 2007
310
Constableville, NY
New to the group searching around for some answers my Harman P68 after an extensive cleaning has a weak flame and will not increase.

Was there a weak flame before the cleaning or only after the cleaning?

Did your extensive cleaning by chance include cleaning the "fines compartment" ? It's really easy to accidentally improperly close the lid on that compartment and not get it sealed up. If it's not properly sealed it will leak so much air that the vacuum switch won't close and to allow the igniter to function and the stove won't burn properly either. There's a slot in the top of the fines compartment cover that must slide over a tab that sticks vertically upward from the feeder weldment. If you're doing this by braille it's easy to get it wrong. Depending on your installation you may need a mechanic's mirror and flashlight to look at it.

YMMV,

Hugh
 
Last edited:

Washed-Up

Minister of Fire
Nov 5, 2011
802
Kananaskis,Alberta, Canada
Also, haven’t seen it mentioned, check your intake flap and make sure it’s moving freely
 
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gunslinger1919

New Member
Nov 13, 2020
7
MD
Checked into flap it is opening fine as I have an outside air kit. The fines box was cleaned as well I have it back over the little lip and wing nut tightened down. Once I get a new lower door gasket I’ll replace that this week. Thanks for all the follow up and challenges on cleaning and reassembly.
 
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gunslinger1919

New Member
Nov 13, 2020
7
MD
Ok just pulled the fines cover again and put it back on.. I jumped pressure switch and the stove started right up. So possibly low pressure somewhere maybe that bottom door seal I need to replace it this week.
 
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SciGuy

Feeling the Heat
Aug 17, 2007
310
Constableville, NY
Ok just pulled the fines cover again and put it back on.. I jumped pressure switch and the stove started right up. So possibly low pressure somewhere maybe that bottom door seal I need to replace it this week.

How's the flame now? If it's good, you just found your air leak. I've flubbed getting the fines cover on more than once when I was certain I'd done it correctly.
 

gunslinger1919

New Member
Nov 13, 2020
7
MD
Flame is running good! Obviously the initial big one until burned down but looks normal.
28A1382E-EE29-44DD-83F7-17AAD94660B4.jpeg
 

SciGuy

Feeling the Heat
Aug 17, 2007
310
Constableville, NY
Excellent!!! I'd go ahead and unjump my vacuum switch. I expect things will fine now.

I love it when things come together.

Don't forget to close your hopper lid.