Oven not reaching temp & overheating

[DIYJUNKIE247]

Hi Everyone

 

Yesterday my oven (Samet - basic model built in) was stuck on 115 degrees C. I had it on normal top & bottom element setting. After a while I put the grill function on and it eventually exceeded 120 (after more than 1 hour in total. I figured the bottom element might not be working so the putting the grill on helped it to increase in temp. 

After some online searching I removed the oven and tested the bottom element for continuity... nothing. And it looks pretty beat up with holes in and deformed. So I think it's safe to say it needs to be replaced. 

What concerns me is when I switched the oven from grill to bottom element (yesterday) the temp proceeded to increase past the 120 mark I set it to. When I turned the know higher it only switched off past 150, so it heated 30 degrees and climbing past the intended temp. This concerns me as another person with the same cheap model over caught fire. 

The temp sensor only has a copper wire running from it, to where it connects to the control board, so I'm unsure how to test it. As the other tests from temp probes online shows two wires in order to test the Ohm rating. 

I'll order the element so long tomorrow, just want to figure out what caused the overheating also. It's a basic oven, no fancy LCD's, uses turn knobs and a simple led light to show when it reaches temp by switching off.