Oven won't stay alight . has never worked from new . have checked all thermocouple connections all seem's well. probe is tight and in correct position.

The Thermocouple safety device needs replacing. The thermocouple usually has a pilot light deflector over it. Make sure it hasn't moved or fallen off, or rotted out.

Please always include full 'make model (what it is)' as first 3 words in every question.

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Normally the thermocouple is not working properly. The thermocouple opens the main gas valve once it registers that the pilot is alight and hot.

most likely thermocouple is bad or dirty,make sure flame is hitting sensor

It sounds like there may be an issue with the gas valve or the thermocouple on your Williams gas wall heater model # 5009622. The fact that the pilot light will not stay lit and the burners came on and went off after cleaning the thermocouple, suggests that there may be a problem with the gas valve or thermocouple. Additionally, the fact that the pilot light went off in the middle of the night, it could also be a sign of a problem with the thermocouple.
Possible causes for this issue include a malfunctioning thermocouple, a faulty gas valve, or a problem with the voltage to the gas valve.
Here are some steps you can try to fix the problem:

1. Check the thermocouple: Make sure that the thermocouple is properly installed and that the wire connections are secure. Also, make sure that the thermocouple is clean and not corroded.
2. Check the gas valve: Make sure that the gas valve is functioning properly and that it is sending gas to the pilot light.
3. Check the voltage: Make sure that the voltage to the gas valve is correct and that the wiring connections are secure.
4. Check for leaks: Make sure that there are no leaks in the gas line.
5. If the problem persists, it's best to contact a professional HVAC technician or the manufacturer for further assistance.

It's important to note that working with gas appliances can be dangerous, if you're not comfortable working with gas appliances, it's best to get it serviced by a professional.

Sounds like the control board is not communicating correctly with the rest of the unit, consult a professional.

Normally the grill is completely separate to the oven. Press the ignitor before you turn on the grill, as, to ignite, oxygen needs to be present (ie: not flooded with gas) . and you should be able to see the spark from the ignitor in the grill. if you can't, then you may have problems with your ignition pack or ignition leads.

The pilot light jet may have got a little bit of dirt or grit in it which is preventing it from keeping alight. Try probing the jet with a fine piece of wire to see it the blockage can be dislodged. You may have to unscrew the jet to clear it by blowing air through it. Make sure gas is turned off first before removing any parts.

The pilot light also has a thermocouple that allows gas to the pilot light while the flame is burning. If flame goes out it shuts gas off to the pilot jet. The thermocouple is bypassed by a switch during the initial ignition and once the thermocouple warms up after a minute or two of holding in the bypass switch, it should maintain the pilot. If, after cleaning, the pilot light keeps going out, it would seem that your thermocouple is faulty and needs to be replaced

Remove the thermocouple from the end opposite to the flame, usually an 8mm nut. Give the little nodule at the end of the copper line a quick shine up with some wire wool (not to aggressive, its just to make a good electrical connection). Tighten it back up 1/4 turn past hand tight only. If that still doesnt work and the falme is nicely in the tip of the flame you will need to replace the thermocouple. Pretty simple job and they are usually about $30. Thermocouples do wear out.

That could be one of 3 things: The thermocouple could be bad, the hole that the thermocouple screws into could have corrosion and causing a loss of electrical current to the safety magnet. Or the safety magnet itself is bad. The thermocouple when heated generates electricity. The magnet inside the valve is powered by the thermocouple. If the pilot light goes out the magne looses energy and the spring attached to it shuts off the flow of gas. Pretty clever ain't it?

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Are you giving the thermocouple time to warm up?
You have to hold the oven knob in for a while to warm the thermocouple before the oven will stay alight. If you are doing this then the thermocouple needs replacing.

See my other posts for a link and price as it was at that time.