Resideo Q340A1066 18" Thermocouple 30mV

The Resideo Q340A1066 Thermocouple is a key safety component in gas-fired heating systems like furnaces and boilers, weighing in at just 0.11 lbs. This 18-inch long wire acts as a temperature sensor with the tip positioned directly in the flame. The heat from the flame generates a small voltage signal (26-32 millivolts) due to the difference in temperature between the tip and the base of the thermocouple. This signal is sent to the gas control valve, ensuring it receives the correct voltage to regulate gas flow safely and efficiently. If your furnace is malfunctioning or experiencing gas flow issues, a faulty thermocouple could be the culprit. Replacing it with the Resideo Q340A1066 Thermocouple can restore proper gas flow regulation and ensure safe and efficient heating for your home.