Bosch Burner Lights, Then Goes Out
Each Bosch burner has a thermocouple, a thin metal probe next to the flame. When heated, it holds the gas valve open. If the burner goes out as soon as you release the knob, the thermocouple is dirty, bent away from the flame or failed. Hold the knob in for 10–15 seconds first. If it still goes out, it needs replacing.

