Gas Hot Water Heater Thermocouple

This signal keeps the gas valve open.

Gas hot water heater thermocouple.

A water heater or furnace thermocouple is a heat sensitive probe that sends an electric signal to the gas valve whenever the pilot is lit. First shut off the gas valve on the water heater and the gas valve on the gas line near the heater. Some gas fired heating equipment relies on an electronic ignition to ignite the flame. If the pilot light goes out the thermocouple acts as a safety device by preventing the gas valve from opening and potentially filling the area surrounding the water heater with natural gas.

The thermocouple on gas fired heating appliances is mounted to sense the presence of a gas flame or gas pilot flame. Universal gas thermocouple includes universal adapter fittings and is compatible with screw in push in or clamp type pilot burners. It is designed for gas furnaces and 30 mv systems. Diy hot water heater repair.

A gas water heater in boise baton rouge buffalo or boston uses a thermocouple that includes a probe attached to a copper tube that screws into a port on the gas valve. If the thermocouple is working you should be able to measure 30 to 40 millivolts of voltage at the connection end of the tube when the pilot flame is on. For gas furnaces and 30 mv systems. Rheem performance plus 40 gal.

The thermocouple is part of the pilot assembly where one end is always in contact with the pilot flame while the other side is connected to the gas control valve. A thermocouple or flame sensor is a device used to control gas flow in gas water heaters. On older style heaters with standing pilot lights the device is typically called a thermocouple while on newer units with electronic ignition the same or virtually the same device is called a flame sensor. A faulty thermocouple or one that is simply dirty may consistently prevent the gas valve from opening or the pilot from staying lit.

The honeywell 24 in. The other end of the thermocouple s tubing connects to a port on the gas regulator or gas valve but not all of these systems use a thermocouple. The element is built for reliability and long life. The gas water heater thermocouple is the safety element that is designed to inform a gas control valve is the pilot flame on or off and open or close the gas to the main burner.

Tall 9 year 38 000 btu ultra low nox uln natural gas tank water heater model xg40t09en38u1 view the performance plus tank gas water heater 639 00 639 00. Positive positioning for quick insertion. Then unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. The burner typically sits loosely or under clips in the burning chamber and just slides out.

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