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Sounds like the pilot is mounted to far away from the burner. I have seen it happen before where the pilot has detached and the main burner will just keep pumping gas in until it hits the pilot flame and just flash flames and everything goes out.
Or it just could be a bad thermocouple that is going out all the time.
Hello, Their is 2 possible things that are causing the oven to not heat.
1) the pilot burner is clogged with build up and not burning corretly...the standing pitol light is small and when the oven is turned on the pilot enlarges and heats a small bulb connected to a tube on a gas valve,if the pilot burner is clogged it will burn the small pilot but will not enlarge to heat that bulb so the gas will flow to the main burner.If that is whats happening the pilot burner needs to be replaced.
2) the pilot burner is properly heating the bulb connected to the above mentioned gas valve but that gas valve is bad and not opening once the pilot has heated the bulb..so in that case that gas valve would need to be replaced
the oven pilot has 2 setting first setting is for you to light small flame, should not be all yellow if it is it has a dirty orifice inside the pilot hood, you can remove this by disconnecting the pilot line from the hood and removing orifice for cleaning, just rub it with a cloth.once clean and replaced you light pilot and check it out. if its ok turn on oven and secondary pilot will ignite that why it got bigger!! this heats a flame sensor to allow 100% safty vavle to open to let gas into burner so yuo can cook.
The thermostat is doing it's job if the pilot gets bigger. When you turn on the thermo, it does 2 things: Makes the pilot bigger and supplies gas to the oven safety valve in the oven. The bigger pilot heats up the bulb from the valve and the stuff inside expands and turns on the main gas. The oven cycles when temo is reached by making the pilot smaller. The most common problem is that the pilot doesn't get big enough to satisfy the valve. Take out the pilot burner ***'y. (7/16" wrench for the nut). Replace the pilot burner. The part is probably a 5414S030 if the valve bulb is located parallel to the ***'y.
Look inside the oven where the burners come into the oven. Right at that point you should find the pilot light. Here is where you light the pilot.If you smell a lot of gas when you open the door, turn off the gas altogether and let it dissipate. Then turn ot on and then you can light it.
the pilot light is there for 2 purposes. number 1 to light the burner and number 2 to heat up the thermocouple, thermocouple is a wire that the flame from pilot suppose to surround by fire. if the pilot is to low it will not reach the thermocouple. you can take the gas line that supplies gas to the pilot and clean it with a safety pin or a small needle. you can test the thermocouple by heating it up with a blow torch on low heat, get it red hot and then turned on the oven. if the oven works clean the pilot, if the oven do not work, replace the thermocouple if separate from safety valve. if thermocouple is part of it replace the safety valve.
The oven pilot will need to be lit, On the bottom there is the oven safety valve, it has a red button on it, you must depress the button and hold it with the pilot lit for 60 seconds, when you release the button the pilot should stay lit and the oven will be ready for operation using the thermostat (knob). Please note: if the oven has set unused for some time you may need to hold the red button for a long time to bleed the air out of the lines. The pilots for the top burners are actually right beside each burner. You may need to turn these pilots on, they are controlled by small valves (small brass screws on the gas manifold where the gas valves and knobs are located, look between the knobs). These small screws/valves will open the gas flow to the pilots when turned counter clockwise. If you open these valves and the pilots still do not work, they will need to be replaced. Hope this helps