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20 USSC
Trouble Shooting
PROBLEM CAUSE: Not enough combustion air; Fuel has too much moisture.
Viewing window becoming black shortly
after start-up.
• Adjust the air damper to a more open position.
• Use a fuel with less moisture content
PROBLEM CAUSE: Not enough combustion air; Fuel has too much moisture.
“Black Popcorn” is present in the burn
chamber.
• Adjust the air damper to a more open position.
• Use a fuel with less moisture content
• Stove might be cycling excessively due to temperature cut backs.
• Reduce heat setting
PROBLEM CAUSE: Chemical reaction between the starch in corn and the heat.
“Clinkers” form in burnpot. • Add calcium carbonate (aka chicken scratch or oyster shell).
• Adjust air mixture
• Use corn with less moisture or starch.
PROBLEM CAUSE: Unit is reaching the “Almost Over-temp” preset.
Unit cycles up and down when on the
“HIGH” heat setting.
• Adjust the heat range to lower setting.
• Fuel burns hot causing the furnace to cycle between high setting and
lower settings.
Disconnect the power cord before performing any maintenance! NOTE: Turning the ON/OFF Switch to
”OFF” does not disconnect all power to the electrical components of the furnace.
Never try to repair or replace any part of the furnace unless instructions for doing so are given in this
manual. All other work should be done by a trained technician.
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PROBLEM CAUSE: Too rich air/fuel mixture
Orange, lazy flame_excessive fuel
build-up in the burnpot
• Clean out the burnpot and burnpot housing
• Adjust the air damper on the front of the furnace to an open position.
• Make sure that the viewing door is closed and sealed properly. If not,
check door gasket..
• Check that all outside connections are clear of any obstructions.
• Check the exhaust system; clean as needed.
PROBLEM CAUSE: Burnpot burns out of fuel
Fire goes out or furnace shuts down. • Hopper is empty, refill the hopper.
• Loss of draft pressure. Make sure that the viewing door is closed and
sealed properly. Check that all outside connections are clear of any
obstructions. Check the exhaust system; clean as needed.
• Check that the pressure switch connection to the firebox is free of ash or
clear of obstructions.
• Auger system is jammed or there is a “bridging” of the fuel in the hopper,
preventing fuel from flowing into the auger feed system.
• Stove may be shutting down to an over temperture condition.
PROBLEM CAUSE: Corn is wet or it has a very high moisture content.
Corn builds up and is not burning com-
pletely. Steam is coming from the corn.
• Use corn with a moisture content of 11% or less for best results.