Top oven (Grill) makes a noise when turned on

The cooling fan is probably the problem , you need to take oven out , take the back off and the motor is fitted at the top , switch grill on and the motor should be quiet

The grill and oven regulator is faulty and needs to be replaced

you can check the element, just get a volt ohm meter, set to ohm's and make sure it shows a short, otherwise you have an open or bad element.

The unit is working as it should. The top oven lights will only come on when the top oven control knob is turned on. The grill control does NOT turn the lights on. If you want to see what you are grilling, then you should turn the top oven control on to its first position. This works even if the grill is operating.

If the fuse or circuit breaker is tripping it is most likely a short circuit in the oven element.

First things first. The oven element is totally separate to the grill element. The clock has to have a time set for either the top or bottom oven to work, whereas the grill will work without the clock being set.
The control knob for the top oven is the ONLY control that will turn the top oven lights on, the grill does not turn the lights on. ( If you want to watch your toast, you have to turn the top oven switch on to the first setting as well as operating the grill control).
To prevent the grill being operated with the door shut, there is a micro-switch on the door hinge that allows the grill to operate ONLY when the door is down. The grill control also does not illuminate unless the door is down. There are two options on the grill control - right or left. One way is the inner element only and the other is both inner and outer ones.
So if you have done all that and it still doesn't work, then the micro-switch could be faulty.
Best of luck

First things first. The oven element is totally separate to the grill element. The clock has to have a time set for either the top or bottom oven to work, whereas the grill will work without the clock being set.
The control knob for the top oven is the ONLY control that will turn the top oven lights on, the grill does not turn the lights on. ( If you want to watch your toast, you have to turn the top oven switch on to the first setting as well as operating the grill control).
To prevent the grill being operated with the door shut, there is a micro-switch on the door hinge that allows the grill to operate ONLY when the door is down. The grill control also does not illuminate unless the door is down. There are two options on the grill control - right or left. One way is the inner element only and the other is both inner and outer ones.

check to see why it is making noise. look at the fan while it is spinning DO NOT INSERT YOUR HANDS and see if you can see what the fan is hitting and why it would be hitting whatever it is hitting could be the shaft onthe motor is maybe bent or a blade is bent on the fan blade itself or maybe something fell into the fan and that might be makin the noise hope this helps

It will be the external cooling fan that is causing the noise.
Probably worn beaqring or broken fan blade.
Normally, the only solution is to replace the fan motor.
It is located at the top of the oven, usually at the rear, but not in every case.
Please rate my solution.
Thankyou.

Update: after using the oven with the grill instead of the fan, the problem sorted itself. With the heating and cooling, obviously some panel had not settled correctly and was causing the vibration. It hasn't happened again so far.