How do I know if my thermocouple is bad?

If you can’t get the flame to light at all, and you’re sure the gas is on, there’s probably an obstruction in the pilot tube. If the flame lights and goes out when you release the gas control knob after holding it in for the recommended 20 to 30 seconds, that’s the sign of a thermocouple malfunction.

What happens when a thermocouple goes out?

If the appliance has a thermocouple, the problem may be a faulty thermocouple. The thermocouple, which operates as a safety device, turns the gas supply off when the pilot light goes out. When a thermocouple fails, the pilot light won’t stay lighted. A burned out or broken thermocouple should be replaced.

Can you clean a thermocouple without removing it?

Yes, you can clean a thermocouple, but the task must be done with a light touch. Remove the thermocouple from the process assembly, using a steel wool or emery cloth, lightly clean the tip removing any build up.

Can a thermocouple be bad if the pilot stays lit?

The function of a thermocouple in a gas valve is to assure that an active pilot light is functioning properly to ignite any supply gas. If the thermocouple fails, for any reason, the gas flow must be shut down even if the pilot is properly lit. The function is termed a 鈥淔ail Safe鈥 mode.

How long should a thermocouple last?

Thermocouples can last up to 10 years if properly installed and maintained, while furnaces can last 15-20 years, although either may wear out sooner in multifamily units.

Can a thermocouple leak gas?

The thermocouple regulates the flow of gas to the furnace. In a few cases, a malfunctioning thermocouple may allow gas to leak into your home, which is a major problem. That’s why, when you detect problems with your thermocouple, you should turn off the gas immediately before calling in an expert to help.

Will gas leak if pilot light is off?

Although this is an area of concern for many people, the reality is that boilers are built so that the gas supply to the pilot light is shut off if the flame goes out. Whilst the cause of pilot light failure needs to be investigated, extinguished pilot lights aren’t going to cause a gas leak.

Will pilot light go out if gas is turned off?

A pilot light is a small flame inside the device that is lit at all times. This flame is used to restart the main burner and prevent gas leaks. Pilot lights will occasionally go out. Sometimes the cause is easily resolved, such as running out of propane or turning off the gas.

Can I use sandpaper to clean a thermocouple?

Cleaning the thermocouple

You can use Emery cloth sandpaper to gently clean any debris or build-up from the end of the thermocouple. Be aware, you may need to detach the thermocouple from the burner assembly to clean it thoroughly. Use a lint-free cloth to wipe the component clean of any remaining debris.

What do you do if your pilot light won’t light?

If your pilot light won’t stay alight, it might be the thermocouple. Sometimes dust buildup collects on the thermocouple and blocks the sensor. Try cleaning the thermocouple and then relighting the pilot light. If it continues to go out, the thermocouple might need to be replaced.

Why won’t my pilot light stay lit in my gas fireplace?

If the pilot light on your gas fireplace won’t stay lit, a very likely culprit is a component called a thermocouple. A thermocouple is a safety device and is a component of the ignition system. Its purpose is to not allow the gas valve to open if the pilot light isn’t lit.

Why does my pilot light keep going out after replacing thermocouple?

If your water heater pilot won’t stay lit even after replacing the thermocouple, you most likely have a faulty gas control valve. It is a sign that the valve is failing to open and allow gas to flow to the pilot. You could also be dealing with a tripped or faulty thermal switch.

Can a thermocouple work intermittently?

In electrical circuits, the most unreliable points are electrical connections. So, if in a thermocouple circuit any of the connections suffer from corrosion or lack of intimate metal-to-metal contact, intermittent operation will result.

Can I replace a thermocouple myself?

1 cause of pilot lights that won’t stay lit is a worn-out thermocouple. It’s easy to replace and a new one costs $5 to $10. Then detach the thermocouple from the burner and take it with you to the home center or hardware store to ensure you buy the right replacement.

How much does a thermocouple cost?

It costs $150 to $250 to replace a thermocouple. It checks to make sure the pilot light is on.

Why do thermocouples burn out?

The most common failure mode for thermocouples is for them to fail open, this is known as thermocouple burnout. Burnout can result from a variety of reasons including the thermocouple experiencing a temperature in excess of that for which it was designed, metal fatigue, and oxidation.