Rubbing sound-like noise when switching bottom oven on

either a bad connection on the element terminals or faulty element

ISOLATE MAINS POWER BEFORE WORKING ON THIS APPLIANCE
Remove the back of the oven check temp controller before replacing or buying element, as this can often stop any heat being produced. The element is in front of the fan, if this model is fan assisted, remove fan, after removing element inspect to see any small hole in metal, if you see a large hole more than 10mm , this could be a sign that the fan needs cleaning. Clean fan with WD40, do not switch oven on untill fan has dried off. Then replace element, switch oven on low with door open, if you feel slight heat, go for a full test, gradually build up heat, keep on for at least 30 mins, make sure the oven reaches temp, you can expect some smell from a new element, this is protective oil, and considered normal.

Most ovens with top and bottom elements have a multifunction control switch which enables the user to select a certain setting to suit their cooking. The control switch would normally have small pictures of the elements, fan forced function etc, to show what each setting does. Sometimes you may only require the bottom element working and other times you may want/need both.

make sure the oven is switched off.remove all trays etc from oven,remove 2 posidrive screws from bottom of fan plate,remove fan plate,the element is around the fan,remove 2 posi screws from where the element goes through the side of oven and the one screw that holds the top of the element to the back of the oven.slowly pull the element out and remove the 2 poz and neg spade connectors.refit as removed.

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The heating element is the likely culprit as they burn out and go open
circuit..(ie ...disconnected and will not heat up )
If you can use a multi-meter , then the element can be tested using the resistance range (with the oven SWITCHED OFF )

seems the heating element burnt out, inspect it for small melted section, element needs replacing, about 25$ at hardware store

Sounds like the heating element has gone. if you can see thee element sometimes you can see damage like a hole or melted metal with white residue

Dear customer,
i recommend u to try the following routine to sort out this problem

Check timer and clock settings

Reseat the element

Test the element

Test the element connectors

Test the oven temperature control

Test the oven selector control

Recalibrate the temperature control

hope u find this useful. thank you.