The only tool you need to replace a thermocouple is a wrench. Use it to unscrew the connector that holds the thermocouple to the gas valve, then unhook the probe from its clip and pull out the entire thermocouple assembly. Before you do this, be sure to turn off the line valve on the gas supply.Correspondingly, how do you replace a thermocouple on a gas fireplace?
Place the new thermocouple in the same place your old one sat and close up the fireplace to conduct a test. Turn the gas back on and relight the pilot light. Give the thermocouple about 15 minutes to heat up and then turn on the flame to make sure it all stays functioning.
Similarly, how do you know if you have a bad thermocouple? If you can't get the flame to light at all, and you're sure the gas is on, there's probably an obstruction in the pilot tube. If the flame lights and goes out when you release the gas control knob after holding it in for the recommended 20 to 30 seconds, that's the sign of a thermocouple malfunction.
Also to know, how do you fix a gas fireplace that won't light?
To do this, hold the pilot button down for about one to three minutes while the air bleeds out. Step 3. If gas is coming out of the pilot, but it still won't light, the spark igniter could be the problem. Alleyne says to look for and clear out any debris between the igniter and thermocouple.
How long do thermocouples last?
Thermocouples can last several years, but they don't typically last as long as the furnace itself. If the pilot remains lit, but the main furnace doesn't stay lit, it's time to replace the thermocouple. Replacement thermocouples are in stock at most hardware and home improvement stores.
Can you test a thermocouple?
Select the ohms or resistance option on your multimeter. Place one test lead on the side of the thermocouple and the other to the end that screws into the gas valve. If the thermocouple has proper continuity, a small resistance reading should be visible on the multimeter.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.Can I replace a thermocouple myself?
Burner assembly 1 cause of pilot lights that won't stay lit is a worn-out thermocouple. It's easy to replace and a new one costs $5 to $10. Rather than trying to unfasten the thermocouple inside the water heater's burning chamber, it's easier to remove the whole burner and thermocouple assembly.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.How do you troubleshoot a thermocouple?
Method 1 Turning on the Pilot Light - Locate the pilot light controls on the gas valve.
- Turn the pilot light on for 30 seconds.
- 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.
How much does it cost to replace a thermocouple?
Thermocouple Replacement - $20-$150 Calling a professional plumber to install a new thermocouple should only be up to $150. If you do the work yourself, you will only pay the price of the part which is about $20.What causes a thermocouple to fail?
Changes in temperature can cause regular expansion and contraction in metal, which will cause thermocouples to weaken over time. After enough time, metal fatigue can cause a thermocouple to break.How do you adjust a thermocouple?
To adjust the thermocouple, you must tighten the thermocouple nut with a wrench. Take care not to apply too much pressure to the nut -- just tighten it slightly. Then try lighting the pilot. If the pilot won't stay lit, replace the thermocouple with a new one of the same type.Can you clean a thermocouple?
If the Thermocouple is faulty it will cause the unit to shut down. How to clean? Remove Thermocouple from pilot assembly, using steel wool or emery cloth to lightly clean the tip removing any soot or build up that might have accorded due to an improper pilot flame.Why does gas fire cut out?
If you get dust in the pilot assembly and the pilot needs to be cleaned out, it produces a "lazy" flame, which will be disturbed by the draught of the main burners. The flame lifts away from the thermocouple and causes the temperature on the tip of the thermocouple to drop. This, in turn, makes the gas valve shut off.Where is thermocouple on gas fireplace?
Locate the gas valve -- it's usually behind a grill on the front of the fireplace -- and find the copper thermocouple wire leading from it. The best way to do this is to follow the wire back from the tip of the thermocouple, which is right next to the pilot light.Can a thermocouple work intermittently?
a safety device that has started to go bad, or has failed permanently. In this client's case, the thermocouple was initially working intermittently, and then finally failed. This allowed the gas to flow long enough to heat up the thermocouple and generate some electrical current flowing back to the gas valve.How close should the thermocouple be to the pilot light?
about 1/2 inch
Why does my gas fireplace go out after a few minutes?
1) There's enough gas flow to maintain the pilot light, but after you burn the larger flame a few minutes pressure drops too low to support the larger flame and it goes out. Pressure builds in the header while you scratch your head, allowing you to run it a few mintues again until pressure drops too low again.Why would a gas fireplace keep going out?
My first guess would be the thermocouple is bad, or going bad. The thermocouple is a small device that generates electricity from heat, they are used in gas furnaces and such to shut off the gas in case the pilot goes out (so gas doesn't continue to flow and fill the room).Should the pilot light always be on in a gas fireplace?
Electronic ignition is when the pilot light on a gas fireplace/insert/stove is only running when the fireplace is on, this means that the unit is likely to have a battery backup as well. A standing pilot is always on, always using a small amount of gas to run constantly unless the gas is physically turned off.What causes gas fireplace pilot to go out?
If the pilot light on your gas fireplace won't stay lit, a very likely culprit is a component called a thermocouple. The thermocouple is a metal rod that sticks out right in front of the pilot itself. It senses if flame is present or not. If the pilot light is lit, it heats up the thermocouple. 
