I restarted it and it's running, but not giving off the same flame as it should. Much colder today, (13f) so we'll see what temperature it can maintain . Haven't got my fingers crossed.
P 61 output levels.
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I am not a Harman tech. 24 years of servicing pellet stoves, and the biggest thing
you learn is that a Modern Pellet stove is a negative draft stove. Combustion air is
pulled into the stove, not pushed into the burn area. If it were smoke would be
pushed out of any area not totally sealed. Your fuel that is at the auger opening will
burn when no other fuel is being forced into the burn pot
From Harman
Yes, Harman pellet stove hoppers are designed to have a tight, nearly sealed system with gaskets and pressure switches, requiring the lid to be closed properly for safe and efficient operation to prevent fire/smoke issues and ensure proper pellet feeding. While older models were fully sealed, newer ones (like some P-series/ultralight) have a small opening to the augur for debris, but still rely on a good lid seal.
So basically, no air should be pulled through the auger shute.
Most interesting, I'm not going to take what I see as gospel, I'm watching the thermometers in the house to make a better decision. I do notice that when I fill it up, the air draw drops with the lid open.
It sure pulls it through the pellet box, I can see the difference when the lid is open. I can also see it in the flame direction and intensity. Point is it worked fine for at least 5 days doing nothing but filling it. No change in flame or heat inside or outside day or night. Highs and lows where 18-20f. very weird weather since Sunday. I did turn it down from 6 to 5 yesterday afternoon because it for some strange reason came up 3 f. It was still at 74 and running fine at bed time. This morning it was a pile of ash, so I turned it up to 6 and it barely did anything. I had to dig unburnt pellets out of it and clean and restart it. Better results now. Watching the thermometer. 👍
At this time it's 13f outside wind chill 4f, and 77f inside I'm using 3 thermometers (1 front 2 back front one is at 80) due to running my back up stove while fooling around. I'll post back in a couple of hours and if there's a huge change I'll know then. If not then it's working fine. I doubt it will hold those temps but anything above 72 is good. This stove doesn't have the capacity to maintain 72 in these temps, so I'm not expecting it too. Down to 75 now at the back.
Last edited:
NS P-68
New Member
Nope, same pellets from the same place, using them for a year. I thought it might be the issue, but the key here is when it gets turned down it does it. This the second time in 3 weeks it's done it and that was when it went into idle mode the 3rd time testing out room mode. Worked the previous times fine. Which were an hour prior to it failing.
NS P-68
New Member
It sounds like an ESP or room sensor probe to me.
Make sure your burnpot holes are clean and the compartment under the burnpot is free of excess ash.
You could also try spraying your control panel dials (pots) with an electronic cleaner....I use De-oxit.
Make sure your burnpot holes are clean and the compartment under the burnpot is free of excess ash.
You could also try spraying your control panel dials (pots) with an electronic cleaner....I use De-oxit.
I've got a new updated board and the ESP was checked when I got new board which was maybe a year ago. It's old, Ive had everything pretty well changed out since I bought it .
Can some one post a picture of the flames they're getting at a certain level, so I compare? Especially where the pellets are burning. Front or back of the pot. I get massive flames and heat when it burns at the mouth of the auger. Sometimes it burns both at the front and back of the pellets. Sometimes just the front. Right now it's both mostly the front. This morning it was at the mouth of the auger (back of the pellets) with unburnt pellets mixed in.
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