I have a blue flame vent free heater. This will be my third year using it. It has always burned clean and has never smelled. Today it smelled while it was burning and it actually hurt my eyes.What would cause that to happen?

Shut it down because the life you save might be your own. The unit is not burning correctly. It can make you sick or actually kill you with CO . If you can find your owners manual follow the directions contained in it under problems exactly.

I have a blue flame vent free propane garage heater.This is my third year running it.It has always run clean and has never smelled.Today it started smelling while it was burning and it actually started to burn my eyes.What could be causing that?

Shut it down because the life you save might be your own. The unit is not burning correctly. It can make you sick or actually kill you with CO . If you can find your owners manual follow the directions contained in it under problems exactly.