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 for our purposes we ll refer to both devices as the thermocouple.
Replace thermocouple sealed hot water heater.
Turn off the main gas shut off valve that supplies the water heater.
Replace the two piece wire connector onto the thermocouple and igniter wire securing it with the retainer clip and slide the manifold burner assembly back into the water heater.
The thermocouple is a thermoelectric device that shuts off the gas if the pilot light goes out.
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Check the following when your water is not hot enough.
The thermocouple is a heat sensitive.
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At the base of the gas water heater there is a gas valve with the thermostat.
How to replace a thermocouple on a hot water heater.
1 cause of pilot lights that won t stay lit is a worn out.
It is usually located beside the unit.
Step 8 reattach the manifold tube pilot tube and thermocouple to the gas control valve thermostat and tighten them using the adjustable wrench.
How to replace the thermocouple if it is broken and how to test the element.
Replace the heating element or thermostat.
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In simple terms it s a short piece of tubing that runs from the gas controller to the pilot.
Get your thermocouples here.
Raise the temperature setting on the thermostat.
Flush the heater to remove sediment from the tank.
When the pilot light on a gas water heater won t stay lit the problem is usually a faulty thermocouple.
Insulate the hot water pipes.
Learn how to replace this inexpensive part and keep your hot water heater working for years to come.
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Remove the burner assembly and detach the thermocouple.
Removing the thermocouple is easy and it requires only a screwdriver.