Furnace Thermocouple Test

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.

Furnace thermocouple test.

When it stops working the furnace s pilot light also turns off. How to test a thermocouple with a multimeter. 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.

Discretion should be used if the reading is between 21 and 25. If the pilot lights but won t stay lit the thermocouple is probably bad. The concentric design of the isotech 877 thermocouple calibration furnace avoids the large temperature gradients present in simple tube furnaces. Thermocouples designed for residential gas appliances such as fireplaces water heaters and furnaces are made for 30 millivolts.

Your furnace s thermocouple is usually located right in the flame of the furnace s pilot light. 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. A thermocouple is a safety device that helps control the gas supply in gas heated furnaces. 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.

Saturn model 877 thermocouple calibration furnace to 1300 c product details. How to inspect your furnace s thermocouple. If you re still unsure or don t have a working pilot light test the thermocouple with a multimeter. You will need a wrench multi meter and a flame source like a candle or a lighter to perform the test.

Every gas appliance with a standing pilot that cycles on and off needs a thermocouple. Importantly always make sure the tip of the thermocouple is directly in the pilot flame. If you test the thermocouple with the multimeter and you get a reading above 25 then you have another issue. Anything under or hovering around the 20 millivolts mark means the thermocouple needs to be replaced.

The queen s awards for enterprise. You can test it with a multimeter. For a basic test attempt to turn on the pilot light again.