Arrived on site to diagnose no heat on propane boiler. After our initial inspection, we found that the spark igniter had some soot buildup on it.mwe cleaned it off and boiler started right up. When boiler started there was a very loud subwoofer like sound. We provided an estimate to do a tune up so we could dig deeper into the cause of the noise. It was accepted. We started by turning the gas off and pulling the burner tubes out. We found that they were dirty and had a lot of debris built up inside of them and the burner compartment. We wired brushed the burners and vacuumed out the compartment. We then inspected the heat exchanger which looked good. We put the burners back into place and connected pilot tube. Checked for gas leaks using bubbles. Hooked up manometer and checked gas pressure when boiler kicked on. Pressure was good and the subwoofer-like sound went away after we cleaned the burners. Performed a combustion analysis and checked for CO leaks. Analysis was good and no CO
