Excessive odor can be caused by any condition that disrupts the factory specifications regarding A. Air flow or B. Fuel flow. A disruption in either will create a condition that is not allowing complete combustion of the fuel that is being delivered.

Things to check:

• Is the motor turning specified rpm’s?
• Is the fan in like new condition or are the blades bent or missing.
• Inside the combustion chamber: insects, insect nests, rodent nests, dirty or faulty orifice, rusted out chamber, dented chamber, or any other condition that can disrupt the flow of fuel or air.
• Faulty LP regulator......... delivering more fuel to the combustion chamber than can be burned, creating odor and a possible unsafe condition. Most of these heaters require less than 1 psi, which is very minimal, and difficult to calibrate without specialized equipment.

These tips and suggestions come from Phillip H. (quite possibly the best heater mechanic to walk in these United States of America!)