Replace Thermocouple Furnace Pictures

For a basic test attempt to turn on the pilot light again.

Replace thermocouple furnace pictures. A trane gas furnace has a thermocouple that is attached to the pilot light. If the pilot light won t stay lit the thermocouple may be faulty and should be adjusted or replaced. Most gas furnaces use either a flame sensor or a thermocouple often referred to as a thermal coupler both are safety devices that sense the presence of a flame and control the flow of gas to the appliance accordingly. Rough video of how to change your thermocouple on most older furnaces.

What does a thermocouple look like and how do you find it. Your furnace s thermocouple is usually located right in the flame of the furnace s pilot light. If no flame is present the sensor stops or prevents the flow of gas from the gas valve thus preventing the dangerous situation of gas flowing into the appliance when there. Honeywell home cq100a1005 u cq100a1005 replacement thermocouple for gas furnaces boilers and water heaters 36 inch 4 7 out of 5 stars 196 9 79 9.

How to replace a thermocouple on a weil mclain gas boiler. How to inspect your furnace s thermocouple. The thermocouple attaches to a fitting on the gas line at one end and to the pilot light orifice at the other. If the pilot remains lit but the main furnace doesn t stay lit it s time to replace the thermocouple.

The job of the thermocouple is to sense whether or not there is a flame and to stop the flow of gas if there is not a flame. Because they come in different sizes take your faulty thermocouple to the store with you so you can make a correct match. Replacement thermocouples are in stock at most hardware and home improvement stores. When it stops working the furnace s pilot light also turns off.

You will need a wrench multi meter and a flame source like a candle or a lighter to perform the test. If you re still unsure or don t have a working pilot light test the thermocouple with a multimeter. The thermocouple is a gas furnace component located near the pilot light burner. A thermocouple is a safety device that helps control the gas supply in gas heated furnaces.