Furnace ignites but produces a lazy, dark orange flame with heavy soot.

Safety first: Turn off and unplug the furnace before cleaning or adjusting air settings.

Steps:

• 1. Clean burn pot: Remove and thoroughly clean the burn pot, ensuring all air holes are open.
• 2. Check combustion air intake: Inspect the outside air kit (if installed) or intake opening for obstructions. Clear any blockages.
• 3. Inspect combustion blower: Clean the blower wheel and housing. Replace the blower if it is not reaching full speed.
• 4. Adjust air shutter: If your model has an adjustable air shutter, open it slightly to increase air. Make small adjustments and observe the flame; it should become brighter and more active.