Furnace Thermocouple Test

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.

Furnace thermocouple test.

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. Anything under or hovering around the 20 millivolts mark means the thermocouple needs to be replaced. This device generates a small electric signal to keep the gas valve open when the pilot is on.

If you re still unsure or don t have a working pilot light test the thermocouple with a multimeter. The queen s awards for enterprise. How to test a thermocouple with a multimeter. If the pilot lights but won t stay lit the thermocouple is probably bad.

High temperature k type thermocouple sensor ceramic kiln furnace with connector plate and hook up cable 2372f 1300c cr 06 4 3 out of 5 stars 45 32 99 32. 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. 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. 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. A thermocouple is a safety device that helps control the gas supply in gas heated furnaces. You can test it with a multimeter. The reading should be between 25 and 30.

Every gas appliance with a standing pilot that cycles on and off needs a thermocouple. If you test the thermocouple with the multimeter and you get a reading above 25 then you have another issue. 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 concentric design of the isotech 877 thermocouple calibration furnace avoids the large temperature gradients present in simple tube furnaces.

How to inspect your furnace s thermocouple. Thermocouples designed for residential gas appliances such as fireplaces water heaters and furnaces are made for 30 millivolts. What does a thermocouple look like and how do you find it.