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This problem you're having is a result of either a dirty pilot a faulty Thermocouple. Cleaning (blowing out) the Pilot with canned compressed air with a straw nozzle (like you clean your computer with) will usually work well. If that doesn't solve the problem, then the Thermocouple needs to be replaced.
Hope this helped you t troubleshoot and solve the problem. Please let me know. Thanks.
Depending on the furnace you might not hace a pilot light. There are several types of ignition devices. One of the more common a pilot light the second being a hot surface ignitor that glows red much like the heating element in a oven. Its possible that the HSI has cracked and needs to be replaced. Look for it on the left or right burner tube in the combustion compartment. It will either look like a rod about 3" long or a flat M.
Sometimes, when DIYers install a new thermocouple they over tighten it. The correct way to install a thermocouple is to finger tighten the connection into the gas control valve and then, with appropriately sized open in wrench, tighten it only 1/4 turn more. Over tightening it, can cause the control valve to lockup. Also, check the positioning of the thermocouple. The pilot flame should engulf the tip of the thermocouple. If it doesn't reposition the thermocouple and clean the pilot. Especially clean it, if the pilot flame is curling upward, instead of being straight out.
Hope this helped you troubleshoot and solve the problem.
Not knowing what kind of heater you have, I will have to guess. I know wall heaters have thermocouples that keep the pilot light on. If this is what you have, the thermocouple needs to be replaced. Its the part that is coiled up screws into the gas valve, and runs along side of the pilot tube. The end of it is in the flame at all times. The end also is a little larger and looks like a tube. You can get one at any hardware store for about $ 5 and come in different sizes. Get one that is 36" long, this is most common. Just pull on the old one and it will come out. They come with several adapters to make the new one stay in place. Make sure the tip is well in the flame. and this will solve your problem. Shastalaker7 Please rate me. A/C, & Heating Contractor
There are several things that could cause this problem. The 1st thing to try is to expose the terminals on the thermostat. With a small piece of insulated wire find terminals R and W and touch from red to white and hold there. You may see a small spark but don't let this alarm you.Now have someone go see if the burners start up when it is jumped out.If it comes on, then the thermostat is faulty.If not, i would need to know if this unit has a standing pilot(lit all the time) or an electronic module. If its an older furnace with a standing pilot, see if the pilot flame is a nice blue flame with no yellow tent to it.I have seen many times where bugs,flys,ect, will die in the pilot tube and cause the flame not to get hot enough or surround the flame sensor and this will keep the burners off.If it has a Ignitor module for the pilot, and it clicks and lights the pilot and burners fail to light, the module could be faulty. Also, if the thermostat is good and you have a meter, the main gas valve (MGV) needs to be checked for 24volts at the Hot and common terminals.I am almost positive it is the thermostat, but I would have to be there to trouble shoot it. I hope I havent confused you more.Dont let the voltage at the t-stat scare you. Good Luck, Sincerely, shastalaker7
the pilot burner[generator] must get an intense blue flame from the pilot ifs that'shapping then if all in working order then gas valve will open when you call for heat .now to know the current strengh of the pilot generator you would need a miivolt test metet[about 650 milivolt output]then if ok you could say gas valve.thats all just so you know how it works.so you probleydont have a milivolt meter so i would say,maker sure pilot nice blue hot flame.clean all connections so no buildup creating loss of signal on wiring,if that dosent solve problem ,start with cheapest item first and work thru problem from their.i hope that helps.God bless.,tom ps if i have been helpful please remember too help me with my ratings,thanks tom
First, turn the wall switch to the off position. Second, turn the key all the way tcountercockwise to the open position. At the front of the unit, below the hearth opening there is a black front access panel. Should have a little recessed part. pull it out and expose the gas valve. Turn the plunger/knob that says off, on, pilot to the pilot position. You'll knw your in the pilot position when it lines up with the indicator (usually a red or black mark on the gas valve body). If you are in the pilot position, you will be able to push in the pilot (it will feel springy). Push the plunger in and then push the red button (piezo ignition button) in until it makes a snapping sound. You may have to do this several times because the air has to bleed out from the pilot tubing. This should light the pilot BUT wait. DO NOT LET GO OF THE PLUNGER ONCE THE PILOT IS LIT. You need to keep the plunger depressed for about 30 seconds and then let it go. After 30 seconds let the plunger go and verify the pilot is lit. If not try the last step over. After the pilot is lit, you may turn the plunger/knob to the on position. Now go back to the wall switch and flip it on. If it doesn't come on tap it hard. Sometimes dust can actually prevent it from making good connection. I work on fireplaces for a living and coincidentally worked on this model today. Simple as pie.