Belling countrychef - Main oven gas doesnt stay on after ignition. We tried holding the knob in for 3-4mins but gas cuts out as soon as you let the knob go. there is no debris on the burner etc

You will need someone to open and replace faulty part or parts, and since this is an online only site, even the purchase of replacement parts will be an issue for you. I am sorry to inform you, but it will be likely that you need to purchase a new oven if you haven't found someone to repair it.

FIXYA tends to be for do it yourself repairs and questions, and when I searched the internet for information I only saw the following video showing a technician unscrewing parts, but really not providing enough help to assist you. Unfortunately, you will be faced with paying a repair technician or purchasing a new oven.

Video: https://appliances.wonderhowto.com/how-to/replace-fan-oven-element-belling-cooker-261386/

https://www.manualslib.com/brand/belling/
pls look here

Sorry but this is not a parts site. This site has no means of looking this up for you.

which is going out top or bottom? may want to check the oven safety valve though it does not normally go out compared to other components. may have a bad igniter ( does it glow or lite up at all) it may still glow but not put out enough current to ignite flame? check with multimeter as well. if oven top is going out also check the igniter model or infinite switch

Does your oven need an electric connection? Check if the plug is in the socket properly, if it is change the fuse and see if it works. If it does work check the. lead for a possible bad connection in the fusetop

get in a gas fitter as there is a burner problem
probably best if you junk it and get a new unit
much safer with gas units

I offer free advice bcuz God is so good!
GAS OVENS
The spark igniter tip is dirty (can clean it with either a little wire brush or a piece of fine sandpaper).
2) The Pilot flame is too low, and the tip of the igniter is not in the flame good enough. (the flame acts as a circuit when it touches the tip & completes the circuit).
3) The spark module is no good and needs to be replaced.(But 1 & 2 are your best bet).
spark module does not sense the flame when it's on. The spark igniter is also the flame sensor which provides feedback to the spark module.

Make sure the igniter is properly aligned with the burner lighting holes and it is clean. All lighting holes must be clean too. You can enlarge them using a drill bit one size bigger.

If it would not fix the problem, replace the bake burner and the igniter.
There is a small chance for the spark module itself to be bad as well.

The oven safety valve
(also called the gas valve) is the part that ensures that gas is not released until the igniter has reached the correct temperature needed to ignite the gas. While this part can fail, it is uncommon. If the hot surface igniter does not glow you should first verify that you have voltage to the circuit. This is a live voltage check and should be performed by a qualified person. If voltage is lost at the valve terminals then you should verify the continuity of the bi-metal in the valve using a multi-meter.


ELECTRIC OVENS:

CHECK THE OVEN RELAY CONTROL BOARD Aclicking sound could be something wrong with a relay. Check for any loose connections around the main control board on your oven. The click you hear is a relay losing power and switching back on. If the clock resets then something is causing power interruptions to the board.

: I offer free advice bcuz God is so good!

Hello,

While your holding in the knob after lighting the pilot,their is a thermocoupler that is heating up and will hold automatically what your pushing in, that thermocoupler is defective

Yes very simple. There is a bulb the flame is heating with a small tube that runs to the gas valve this is the saftey sensor that is bad called a thermo-couple , they are common to go out and should be easy to find online. Let me know if you have any other questions.
Phil