Originally Posted by P B G
My second heater is also acting up, I suspect it has an issue with plugging in the gas line, as it has a rather yellow flame, although judging from the rust up under the heater, I think it is the OEM one with the shop.
Have you checked the gas line drip legs at each heater unit? You may have condensation in the gas lines. The yellow flame indicates poor combustion (as you may know).
I had an issue with my garage heater where the pilot light sounded like someone was blowing on it or it was exposed to a stiff breeze. Occasionally, it would go out. It turned out that the pilot assembly was dirty. As rebake mentioned, a blast of compressed air should resolve that. My yearly maintenance, before I light the heater for the winter, involves liberal applications of compressed air to all of the internals. That's overkill but it does clean a lot of residual dust and has kept the pilot light working, issue free.