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The Thermocouple is a safety device commonly used in gas boilers and burners to detect the presence of a flame. It generates a small electrical voltage when heated by the pilot light, which keeps the gas valve open. If the pilot light goes out, the thermocouple cools down and shuts off the gas supply, preventing leaks. This component is crucial for safe operation and is often replaced during routine boiler maintenance. A faulty thermocouple can cause intermittent heating or complete system shutdown, making it a vital spare part for any gas heating system.