Why do my thermocouple keep going bad?
Changes in temperature can cause regular expansion and contraction in metal, which will cause thermocouples to weaken over time. After enough time, metal fatigue can cause a thermocouple to break. If thermocouples start to give out unusual readings, it may be suffering from metal fatigue.
Do you need a thermocouple in a water heater?
If you have a gas water heater, gas wall heater or any other appliance with a gas burner that needs to cycle on and off, there’s a thermocouple in your life. It’s a usually reliable device that works in conjunction with a standing pilot, which is the little flame that, like the Olympic torch, burns while the appliance is in operation.
Why is my thermocouple too far from the flame?
The likely problem, again, is an obstruction in the pilot tube. The pilot flame must be big and hot enough to heat the thermocouple to the temperature it needs to generate enough voltage to signal the gas valve. Sometimes the problem is simply that the thermocouple probe is too far from the flame.
How does a thermocouple work in a fireplace?
How a Fireplace Thermocouple Works A thermocouple consists of a long copper tube that has a probe on one end and a threaded fitting on the other that screws into the gas valve.
How does a thermocouple keep the gas valve open?
It does this by sending a tiny electric current to a sensor on the gas valve signaling the valve to stay open. The thermocouple can do this because, in its probe, it contains two different metals, and a voltage is generated when one of them is heated. This is the result of a phenomenon known as the Seebeck Effect.
How to replace a gas flame thermocouple in a water heater?
1 Turn off the gas supply to the equipment. 2 Remove access covers as needed: on a gas fired water heater you will need to remove the manifold door at the heater bottom in order to access the end of 3 Remove the old thermocouple at the gas valve by unscrewing its mounting bolt from the gas valve.
The likely problem, again, is an obstruction in the pilot tube. The pilot flame must be big and hot enough to heat the thermocouple to the temperature it needs to generate enough voltage to signal the gas valve. Sometimes the problem is simply that the thermocouple probe is too far from the flame.
What’s the difference between the pilot flame and thermocouple?
The pilot flame is blue, not blasting the thermocouple, and the tip of the thermocouple (s)all have been slightly glowing. The original thermocouple lasted 8 years. Why are these replacements only lasting a short time. What am I doing wrong.
How does a thermocouple work on a furnace?
The thermocouple is a small electrical device, but it is a critical safety component on your furnace. The thermocouple responds to changes in temperature by producing an electrical current that causes the gas valve that supplies the pilot light to open when the temperature is high or to close when there is no direct heat source.
