Release the button to see if the pilot light goes out. Turn off the gas supply to test the thermocouple again. Count to 20 and wait for the pilot light to go out. Listen for clicking near the gas valve.
How much does it cost to replace a thermocouple? What does a thermocouple look like? The thermocouple looks like a piece of metal tubing smaller than a soda straw. To find it, first locate the gas control box. This is the box that the main gas line enters, where you turn the gas on in the furnace.
The other end of the thermocouple sits in the flame of the pilot light. Does the length of a thermocouple matter? The length of a thermocouple has no effect on its measurement accuracy or its ability to transfer the signal to the instrument.
Are thermocouples universal? Universal Thermocouples. Universal thermocouples, as the name implies work on most water heaters.
They are available online and in home supply stores for a reasonable cost. The length and the thread type are the two concerns when purchasing one. Should a thermocouple be in the flame? Typically the thermocouple sensor is mounted right in the flame of the pilot light on gas fired heating equipment. But not all of these systems use a thermocouple.
Some gas fired heating equipment relies on an electronic ignition to ignite the flame. Those devices generally will not use a thermocouple. Can a thermocouple leak gas? If you cannot see or detect problems proceed with the test. Before the test, turn off the gas supply because you must first remove the thermocouple. Remove the thermocouple by unscrewing the copper lead and connection nut first and then the bracket nuts. Next, take your meter and set it to ohms. Take the two leads from the meter and touch them—the meter should read zero.
Once this check is done, turn the meter back to volts. For the actual test, turn on your flame source, and place the tip of the thermocouple into the flame, leaving it there until it is quite hot.
Next, attach the leads from the multi-meter to the thermocouple: put one on the side of the thermocouple, and attach the other lead at the end of the thermocouple that sits in the pilot light.
A working thermocouple will give a reading of between 25 and 30 millimeters. If the reading is less than 25 millimeters, it should be replaced. Read Full Testimonial. Discover the Difference. Leave Us a Review on Google. Make Payment ». Our Core Values. My name Contact options for registered users. One thing that I have learned Family owns 25 rental units is that these thermocouples can more often than not be recycled.
Try this next time: using a scotch brite pad, scuff the surface. Also, the blue tip of the flame assuming it is a standing pilot should be pointed at the mid section of the TC. How old is the furnace? Reply to My name. Stormin Mormonn Contact options for registered users.
Can you hold it up to the monitor? I can't quite picture that. Reply to Stormin Mormonn.
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