My Stove is Burning Dirty.
My Stove is Sooting.
My Exhaust is Smoking Heavily.

Bad pellets, wet or old pellets, pellets which have been wet will not burn as clean or as hot.  Try using a different bag of pellets especially if the ones being used are old, from a torn bag, or may have been stored in a damp environment. It is important to have dry storage for pellet fuel.


Improper installation, lack of outside air source or using too long a pipe to bring in air will cause air deficiency. Too long a flue pipe, or too many elbows, intake or exhaust can also lead to a dirty burn.  Air flow is very important to get proper performance improper installation can cause resistance to the flow of air, causing fuel to burn dirty. Refer to installation manual for proper installation to compare your installation to.

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Diagrams and Instructions
for proper installation


Leaky gaskets, door and window gaskets, as well as gasket behind burn box will decrease available air through the fire. To test for leaking door or window gaskets, turn the stove on without building a fire, close the door and take a lit match or lighter and move the flame around the edge of the window and around the door. If the gasket is leaking, the flame will be pulled toward the leak as air is sucked in past the gasket. Gasket should then be replaced.

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Gasket Maintenance


Overfeeding, if too much fuel is cycled into the burn chamber, there is insufficient air volume to give a complete, clean burn. A bag of pellets should normally last from 16 to 24 hours (smaller pellets tend to feed faster than longer ones) if the 40 lb. bag is not lasting that long contact customer service to have a technician walk you through a check of the programming of the control board.


Insufficient combustion air, combustion blower is not running at sufficient speed. The exhaust blower should run at about 3000 rpm. Lubrication may help but replacement of the exhaust blower is the recommended course of action.

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Exhaust Blower


Ash buildup in flue, if flue is not cleaned regularly ash buildup will restrict air volume being exhausted from stove. The flue system should be cleaned on a regular basis. We recommend it be cleaned at least once a month or once per ton of pellets used.

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Cleaning Instructions


Ash buildup in heat exchanger/firebox area, if firebox and heat exchanger are not cleaned regularly ash buildup will restrict airflow through the fire. The firebox must be cleaned on a regular basis and the holes in the firebox must be kept clear. The heat exchanger is located behind the impingement plate and should also be cleaned at least weekly.


Leaving hopper lid open/unlatched, when hopper is not sealed down tight air can be pulled through the hopper and feed system reducing the amount of air through the fire. It is extremely important that the hopper lid be latched down tight while the stove is in operation. Airflow may occur through the auger system and in the event of a power failure or error shutdown smoke can travel back into the hopper if the lid is not sealed down tight!

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to Adjust your
Hopper Lid Latches


Wear plate missing, fire will burn dirty as air cannot get under the fuel and flow through it. The wear plate (or grate) must be present to allow airflow below the fire as well as to diffuse the air and spread it around the firebox to allow complete combustion.

Wear Plate (pu-bp98wp)



Loose bolts holding burn box, if bolts are loose air is allowed around the burn box rather than through it. On the front of the stove , below the ash lip there are bolts that hold the firebox in place and tight against the back of the burn chamber of the stove. This seal is important as the combustion air can leak around the firebox rather than go through it and the fire. Bolts should be tight enough to hold the firebox tight but do not over tighten them.



Improper fuel, burning corn or cherry pits will cause a dirty burn because of the high ash, moisture and sugar content. The use of alternative fuel is possible when mixed with pellets but is not recommended. If the unit is burning dirty and these fuels have been used, clean the entire stove out thoroughly (flue system as well) and burn just premium hardwood pellets to see if the problem goes away. If using these fuels is still desired, adjust the mixture to use less corn or pits per bag of pellets.



High altitude, air density at high altitude can cause dirty burn simply because of  the lack of available oxygen. In installations above 5,000 ft. above sea level the exhaust should be expanded to 4" pellet vent pipe (ac-3100 kit) and the outside air intake should be run with 3" pipe.

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High Altitude Installations

If you have any further questions or concerns, please contact Customer Service at:

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Revised:  11/07/2008

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