This device generates a small electric signal to keep the gas valve open when the pilot is on.
Furnace thermocouple test.
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If you test the thermocouple with the multimeter and you get a reading above 25 then you have another issue.
For a basic test attempt to turn on the pilot light again.
Your furnace s thermocouple is usually located right in the flame of the furnace s pilot light.
If the pilot lights but won t stay lit the thermocouple is probably bad.
What does a thermocouple look like and how do you find it.
Thermocouples designed for residential gas appliances such as fireplaces water heaters and furnaces are made for 30 millivolts.
When it stops working the furnace s pilot light also turns off.
Importantly always make sure the tip of the thermocouple is directly in the pilot flame.
If you re still unsure or don t have a working pilot light test the thermocouple with a multimeter.
Discretion should be used if the reading is between 21 and 25.
A slim rod shaped flame sensor sits in the path of your pilot flame where it collects and then transfers heat down via a flexible connector wire or tube to signal through an electrical charge that the main gas valve should open.
You can test it with a multimeter.
A furnace thermocouple is a device on a standing pilot gas furnace that s responsible for opening and closing the main gas line to your home s heating system.
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How to inspect your furnace s thermocouple.
You will need a wrench multi meter and a flame source like a candle or a lighter to perform the test.
This monitoring is necessary because the heat of the pilot flame sends the necessary voltage to open the valve to turn the furnace on.
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Anything under or hovering around the 20 millivolts mark means the thermocouple needs to be replaced.
How to test a thermocouple with a multimeter.
A thermocouple is a safety device that helps control the gas supply in gas heated furnaces.
The reading should be between 25 and 30.
