Thermocouples can last up to ten years when installed and maintained properly, while furnaces can last between fifteen and twenty years, although both may fail sooner in multifamily units.

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 How do I determine if my thermocouple has failed?

If the flame does not ignite at all and you are certain the gas is turned on, there is most likely an obstruction in the pilot tube. If the flame ignites and then goes out after holding the gas control knob for the recommended 20 to 30 seconds, this indicates a thermocouple malfunction.

 Do thermocouples degrade over time?

As with other furnace components, the thermocouple can deteriorate over time, producing less voltage than it should when heated. And the worst part about it is that you may be unaware that you have a defective thermocouple. As such, inspecting and testing your thermocouple should be included in your furnace’s routine maintenance.

 What is the cost of replacing a thermocouple in a furnace?

The cost of replacing a thermocouple ranges between $150 and $250, primarily due to labor time. It also checks to see if your pilot light is lit on older models without an ignitor. If it is not, the gas will be turned off.

 How long does a thermocouple for a gas fire last?

While thermocouples can last several years, they are rarely as long-lasting as the furnace. If the main furnace does not stay lit, it is time to replace the thermocouple. Replacements are readily available at the majority of hardware and home improvement stores.

 Is it possible for a thermocouple to be defective if the pilot remains lit?

A thermocouple in a gas valve is used to ensure that an active pilot light is operating properly and is capable of igniting any supply gas. If the thermocouple fails for any reason, even if the pilot is properly lit, the gas flow must be stopped. This is referred to as a “Fail Safe” mode.

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