Burner will not light, but pilot is on

The ignition module is energized solely by the thermostat output. When the tstat satisfies, all power is removed from the module. The pilot and the main burners go out.
When the module trials for ignition, it must prove pilot flame and then turns on the main burner. If it doesn't sense the pilot for some reason, it also disables the pilot solenoid valve.
If the pilot comes on and stays on, but main burner doesn't come on, there's several possible problems:

• Faulty ignition module
• Faulty main burner solenoid valve
• Faulty wiring between the module and valve
• A gas blockage at the main burner

All this under the assumption that the main burner is correctly installed.
https://techtown.partstown.com/thread/1710-i-have-a-duke-e101g-convection-oven-that-is-not-firing-not-sure-what-the-problem-is-it-takes-a-long-time-to-get-to-temp-but-when-food-is-put-inside-it-seems-to-never-make-it-to-temp

A lot of pilot lights have a thermal coupler... the pilot light must be lit for several min to open the coupler so the pilot light will not go out.... the newer systems use an electronic ignition and no pilot light and need power to autostart but the coupler may be gone if you are holding that pilot start button down for several min and the pilot light is still going out..ps.. leave it in pilot mode for several min after initial start up before turning turning full burner operation operation operation operation operation operation operation it will snuff out the pilot light.

For (fire) safety, there is usually a thermostat that will turn off the gas if pilot light goes out.

So when you try to light the pilot you will have keep press & hold the pilot gas supply for at least 10 sec until the thermostat is heated up. Then only when the pilot light stays on continually, can you turn on the burner.

Forget about changing to a High pressure regulator!

see this steps and fix it. God bless you
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If there is no heat, check the electrical service panel for a burned fuse or tripped breaker. Relight the pilot light (see below).
If there is not enough heat, adjust the burner air shutter (see below); and clean the burner ports (see below).
If the pilot light does not light or does not stay lit, clean the pilot orifice carefully with a toothpick, test the thermocouple and replace it if it is faulty (see below).
If the flame flickers, adjust the pilot (see below).
If there is an exploding sound when the burner ignites, adjust the pilot to a higher setting and clean the pilot orifice and the burner ports.
If the burner takes more than a few seconds to ignite, clean the pilot orifice and adjust the pilot light.
If the burner flame is uneven, clean the burner ports. If the burner flame is very yellow, clean the burner; open vents in the furnace room to provide more air; adjust the burner air shutter.
To light the pilot on a standing-pilot (always on) ignition system, follow the lighting instructions located near the control. Otherwise, try these steps:
Light the pilot:

1. Press and hold the pilot control knob to start the pilot. Set the control knob to the pilot position. Hold a long match under the pilot gas port.
2. Press the control knob; the pilot should light. Hold the control knob down until the flame is burning brightly (about 30 seconds). Release pressure on the knob, and turn it to the on position.
3. If the pilot goes out when you release the control knob, try relighting, holding the control knob down longer. If the pilot again goes out, check the thermocouple (below).

Adjust the pilot:

1. Remove any cap covering the pilot adjusting screw on a combination control.
2. Turn the adjusting screw counterclockwise to increase the flame or clockwise to decrease it. It is correctly adjusted when the flame envelops the thermocouple bulb by 1/2 inch and appears dark blue with a small yellow tip.

Test and replace a thermocouple:

1. Hold the control knob to pilot and light the pilot as above.
2. Unscrew the thermocouple fitting with an open-ended wrench.
3. Set a multimeter to the DVC (lowest voltage) scale.
4. Clip one multimeter lead to the end of the thermocouple tube nearest the pilot and the other lead to the fitting on the other end of the tube.
5. If the multimeter shows a reading besides zero, the thermocouple is functioning. Replace the thermocouple tube.
6. If there is no reading, you will need to clean or replace the thermocouple following steps 7 through 11.
7. Release the control knob and shut off the main gas valve on the gas-supply pipe that leads into the burner. Shut off power to the burner at the electrical service panel .
8. Remove the thermocouple from its mounting bracket.
9. Wipe the combination control clean and install a new thermocouple, tightening it by hand, then give it a one-quarter turn with a wrench.
10. Insert the thermocouple into the pilot bracket, being careful to not crimp the tubing.
11. Turn on power to the furnace and relight the pilot (above).

Adjust an adjustable burner air shutter:

1. Set the thermostat to its highest setting to keep the burner running. Once the furnace has heated up, remove the burner access panel and loosen the locking screw.
2. Open the shutter by turning it to the right until the blue base of the flame appears to lift slightly from the burner port surface. Then close the shutter until the flame reseats itself on the surface.

Clean removable burner tubes and ports:

1. Shut off gas and power to the furnace.
2. Unscrew or loosen and remove the tubes from the supporting bracket.
3. Carefully clean the tubes with a brush or vacuum, making sure not to damage the burner ports.
4. Use a stiff wire to clear any debris from clogged ports.

You need a new gas control valve.

Ensure that the gas pressure being fed to the unit meets the standard as rated on the unit's nameplate.
The thermopile must be free of soot or any form of dirt.
Pilot flame quality must be good and can heat up the thermopile properly.
Wiring connectors must be tight.

Regards.

The pilot safety is bad. It is also called a thermocouple. If you look at the pilot through the viewing port you will see a copper probe that will work its way to the gas valve. This is the thermocouple. To remove it, remove the 10 or so screws holding the burner box to the bottom of the combustion chamber, remove the screw holding the pilot assembly to the burner and slowly wiggle out the entire pilot assembly. Unscrew the copper probe from the gas valve than turn it out of the pilot assembly Take it to a good hardware store and match up the length. You may have to purchase a longer one but you can coil up any extra. Reverse the removal procedure to install and make sure you seal up the burner box with high temp silicon prior to lighting.

I would check to make sure control on gas valve is in on position and pilot is lit if you have a standing pilot. If you have a spark or hot surface ignitor make sure they are trying to lit pilot. If you have standing pilot model and pilot lit is not on. Turn control on gas valve to off,wait five mins. then turn to pilot. Depress botton and try to light pilot. If it lights hold down for a couple of mins. then release.. If pilot stays lit turn control to on. If thermostat is calling for heat this should bring main burner on. If pilot does not stay lit then replace thermocouple. Hope this helps. Thanks

If the pilot light goes out when you release the primer,then the thermocouple is bad.You can try to adjust the thermocouple,if it can be.It needs to be in the pilot flame.If the thermocouple is not in the flame,it will not stay lit.If you can not get the pilot to light at all,with the primer pushed down,then replace the regulator.To light the pilot light,you need to turn the dial to pilot.Then press the primer button down and hold it.The primer is either built into the turn knob,or it is a res button.Hold the primer down,and light the pilot,continue holding the primer down for at least 40 seconds.Then release the primer slowly,and if the pilot light starts to get weak,and try to go out,then push back down,and hold 30 seconds more.After the pilot stays lit,turn the knob to furnace or low,or whatever the directions say.

First, never light when the pot is empty, you can fill with water if you have no oil. Open the door, check the thermostat and make sure it is turned off.(The burners will light if thermostat is on) Behind the thermostat you will see the gas valve. Turn knob to off, then to pilot. There is a notch at the pilot position. Now look up in the middle behind the burners and you will see the pilot assembly. Push in on the knob on the gas valve while you hold a long lighter close to the pilot assembly. Once the pilot lights keep holding the pilot knob in for 20 seconds. Now let off the pilot knob. Pilot should stay burning. Now turn the gas valve from pilot to on. Now turn the thermostat to desired temp and the burners will fire off and start heating.