Problems with the thermocouple and pilot tube are two of the most typical reasons. Sensors on the thermocouple detect the pilot light. A malfunctioning thermocouple may arbitrarily conclude that the light is turned off when you want it to be turned on, and vice versa. A clogged pilot tube might potentially cause the pilot to go out. However, even with all pilots extinguished, the fuel will still burn if there's any flame attached to the burner. Therefore, make sure that the fuel line from the tank to the burner is not blocked.
Also, keep in mind that if the fuel cap is not completely tightened, then some air might get inside the tank which could extinguish the pilot light. But even if the light isn't extinguished, there's still a good chance that the fuel will not flow into the burner due to the presence of air inside the tank. So make sure that you tighten the cap properly so that it doesn't allow any air inside the tank.
Pilot lights do have an expiration date after which they should be replaced. The best way to ensure reliable ignition is to put some oil on your finger and run it along the bottom of the pilot hole. This will help prevent the hole from drying out and will also protect against freezing. If you wait until the oil turns black, this means that the hole has been exposed to air for a long time and needs to be re-oiled.
If the pilot does not relight, goes out immediately after lighting, or goes out repeatedly, the most probable reason is a faulty thermocouple. The good news is that a thermocouple can generally be replaced for a low cost and in less than an hour. The bad news is that this requires taking the stove to the shop or home repair person which may mean delaying your meal plan for now. It's best to be safe than sorry so check both thermocouples before trying to fix it yourself.
If the pilot lights fine but then goes out every time you turn on the gas, there may be a problem with one of the valves inside the stove. This can be fixed by replacing the valve stem washers or entire valve assembly. If you're not sure how to do this, you should probably call an expert!
Finally, if the pilot stays lit even when the gas is off, there's no need to panic. This means that the thermocouple is working properly and that the main burner is not firing. To test this, turn off the gas at the meter (not the pilot light!) Then lift up the front panel of the stove and look down into the hole where the burners stick out. If all the holes are black, the main burner is not firing. If only some of them are black, try another set of matches or use a candle to see which ones will light.
Thermocouple failure However, if your thermocouple is broken, dusty, or twisted, it may incorrectly detect that your pilot light is turned off and shut down the gas supply to your system. Your pilot light will not stay illuminated if there is no gas supply.
The most common cause of a pilot light that won't remain lit is a faulty piece of equipment. If you've exhausted all other possibilities and the light still goes out, this is most likely the culprit. In this situation, your pilot light may need to be replaced. A thermocouple failure can potentially cause a pilot light to remain out. This would require replacement of the thermocouple. A loose connection or ground wire could also be the problem if you're using a gas stove.
If your pilot light keeps going out even though you have fuel in the tank and the valve is turned on, there's a good chance that it needs to be replaced. The valve itself is cheap, but the wiring inside the stove is not. If the stove is more than five years old, it may no longer be manufactured with replaceable parts. In this case, you'll need to get everything else off the stove and remove the burner assembly to access the wiring.
Always turn off the gas before working on the stove. This includes turning off the pilot light if one is used. Turning off the gas will prevent unnecessary leaks and damage to your home. When working on the stove, use caution not to burn yourself. Wear protective clothing including gloves for any wires or hoses that might spark.
Stove repair can be dangerous if done improperly. Use caution and follow all safety instructions when repairing your stove.
Loose or damaged gas valves, thermocouples or heat exchangers, poor venting, insufficient gas pressure, or high winds are all potential major causes of pilot light failure. If you suspect a significant condition, don't be afraid to seek expert help. The people who repair and service appliances have names for all kinds of tools used to determine how a component works or has failed. They will know what kind of probe to use on your thermocouple and where to put it so as not to damage the wiring inside the stove.
If the pilot goes out but the main burner stays on, there is still enough gas in the line to burn with some resistance. This means that either the valve on the gas line isn't all the way up or there is something blocking the flow of gas. A loose washer under the valve stem could prevent the valve from closing completely. This would allow gas to leak into the room when you aren't using it, which could lead to fire danger if you have no way to detect the presence of gas.
Pilot light malfunction can also be caused by dirty or defective burners. These need to be cleaned regularly to ensure proper functioning. If a burner is clogged, you won't get good fuel distribution and this may cause burning issues. You should also check the connections at the back of each burner for damage. Loose or corroded wires can cause pilot lights to go out.