You need a new thermocouple. This is a safety device which holds a small gas valve open when a flame is detected. It stops unburnt gas building up in the oven. I would seek professional advice from a gas safe registered engineer. Check www.gassafe.co.uk for an engineer in your area. Good Luck
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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.
If the oven lights for 4 seconds and shuts off you are experiencing an ignition module safety lockout. First verify that the flame is lighting at the top of the burner and reaching the very bottom venturii tube where the flame sensor is located. If this bottom tube isn't lighting or it takes longer than 4 seconds to light then you have a dirty burner and it needs to be taken out and rinsed. If the bottom tube is lighting and then going out your flame sensor needs to be cleaned, which is easy.
most likely all you have is a bad ignitor.if it glows it should ignite the flame in less than 40 seconds,if it doesn't glow,pull it out and read it out with a meter.next time send the model number.good luck.
Opening and closing the door will reset the ignition sequence, do not do this repeatedly as you could cause a build-up of unburned gas in your heat exchanger and damage it. Instead verify that your ignitor is glowing, then see if the burner lights and make sure the flame carries all the way down to the bottom of the burner. If the flame stalls halfway or doesn't make it all the way to the bottom in 4 seconds after 3 attempts you will experience an ignition lockout, a safety feature built into your ignition module. If this is the case your burner needs to be cleaned and serviced, have a professional do it. If the flame is reaching the bottom of the burner but still going out after about 4 seconds then you have a dirty/broken flame sensor. You can attempt to clean your flame sensor by removing the screw that holds it into the burner. With it removed it will look like a metal rod going through some ceramic, clean the metal rod part with a wire brush or emory cloth (fine sandpaper). Replace the flame rod and try again and see if the burner stays on this time. If it still goes out your burner needs to be serviced by a licensed technician.
Replaced the igniter. The parts guy told me that the amperage changes with age and use; thus the igniter still glows, but it takes much longer to operate the gas valve with the reduced amperage. Cost - $70.14
The knob won't have any effect on the flame size. The knob controls temperature. If you're referring to the pilot light staying on and then the main flame not going on...that's another problem. If the main flame will not go on, the assembly that controls the main flame is likely defective. If the unit has a thermocouple, you might change it out first. Sometimes, that's all that is needed and they're cheap.