What could be causing this?

https://my.vulcanfeg.com/resourcecenter/vulcanwolfberkel/ProductDocumentation/F31056.pdf
I think the above link may assist you with your question. Some ovens have difficult access to the thermocouple which is pretty much always right next to the pilot burner. Hope this helps.

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Either the orifice is plugged and you'll have to run a fine wire (like from a craft store) through it to clean it (better still buy a handy cleaning tool for acetylene torches from Sears or another large tool store)--or--the gas valve isn't sending gas through that line. You'd best call a pro for the latter case.

Hi! I have the same problem with one of my burners (I have a morice range). I changed the thermocouple, but it didn´t help. I contacted Morice in France and was told that the problem most sertainly was the coil inside the gasvalve. I don´t know if it possible to dismantle the ovengasvalve to check the coil. As for a burner valve, one should open the valve at the end were the gas goes out to the burner to locate this coil. Best of luck Lars

If you live WAY out in the sticks, all you need is a tank of propane and the reqired fittings,BUT,if you live in the good old suburbs or the city you'd better have the gas company do the job. After all they have to shut off the gas feed to your house anyway. Good luck,Dana

The list of problems is as long as the one Obama inherited when he took over. Good news though, the most expensive part works, the blower motor! The pilot is established which rules out a gas issue. The two most common problems are, either the temp controller or the infinate switch is bad. Your unit has one or the other but, not both. Controller has several wires leading to it & has a green or tan circuit board on it, infinate switch is a small black or white 2 inch square box with 4 or 5 wires leading to it. Each one of these are mounted thru the front control panel & both have knobs. Temp board around $180, infinate switch around $45. As far as the schematic is concerned, Vulcan was bought by Hobart & they DO NOT give out schematics or service manuals.

You should check to be sure your pilot flame is strong and not wavy. This can be caused by the pilot itself being dirty and clogged. The pilot gas orifice is very small and it doesn't take much to disrupt the flame. If this is good and the pilot flame is heating the thermocouple correctly you will need to look at your safety valve. It could be the problem. Be sure not to over tighten thermocouples into the safety valve, they should only be hand tight plus a quarter turn. Any more than that can break the safety and the thermocouple. You should also check the gas pressure, if it is too low or a regulator is not working the pilot can go out when the main burner is turned on (pilot can get starved in low pressure situation). Another item to check is drafts and air movement that could blow the pilot out, since the oven has been there a while this is not likely the cause. I hope this helps. Please take a moment to rate me.

The half inch tubing should be adequate under most circumstances. However, you may run into volume issues while using the oven and a few burners at the same time. If it bothers you, replace it. The door should be flush (or close to it) on the sides and the top. If you have an air gap, check the hinges.

First, you should make sure the unit is set up to run the type of gas you use. If you have natural gas and it is set up for lpg, or vice versa. If it is wrong, you can retrofit it by changing out the orifices. Other than that, check your pressure at the manifold that feeds the burners to see if it is adequate. A bad regulator could very easily cause this problem as well.

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