If the pilot lights but won t stay lit the thermocouple is probably bad.
Furnace thermocouple test.
Thermocouples designed for residential gas appliances such as fireplaces water heaters and furnaces are made for 30 millivolts.
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Every gas appliance with a standing pilot that cycles on and off needs a thermocouple.
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When it stops working the furnace s pilot light also turns off.
How to inspect your furnace s thermocouple.
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.
How to test a thermocouple with a multimeter.
What does a thermocouple look like and how do you find it.
The concentric design of the isotech 877 thermocouple calibration furnace avoids the large temperature gradients present in simple tube furnaces.
If you re still unsure or don t have a working pilot light test the thermocouple with a multimeter.
A thermocouple is a safety device that helps control the gas supply in gas heated furnaces.
The gas furnace thermocouple is an essential part of the gas boiler it is 2 metal pieces that are joined at a junction which is used to monitor the temperature of the pilot flame.
This monitoring is necessary because the heat of the pilot flame sends the necessary voltage to open the valve to turn the furnace on.
The reading should be between 25 and 30.
If you test the thermocouple with the multimeter and you get a reading above 25 then you have another issue.
Importantly always make sure the tip of the thermocouple is directly in the pilot flame.
You will need a wrench multi meter and a flame source like a candle or a lighter to perform the test.
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You can test it with a multimeter.
Discretion should be used if the reading is between 21 and 25.
Anything under or hovering around the 20 millivolts mark means the thermocouple needs to be replaced.
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.
