Most times it is easy to see a failed oven element. Their will be a hole or a welded mark somewhere on the element where a piece of cheese fell on it and caused a hotspot. You can also check elements with a meter or simply apply some wall current to them using a cheater cord to see if it gets warm. If the element gets warm that means it will work and is not bad. If the element ain't coming on but you have checked it out, of course then that would be the thermostat.
HEADS UP: When fooling with the stove always be sure the power is off. Pull out the bottom drawer and most of the time you can unplug the power cord without moving the stove.
To make it easier to work on most stoves the oven door can be removed. I set the door at the broil position and gently ease up on the door, remove it, and set it to the side. As far as the oven thermostat goes, they are simple enough to replace but quite expensive. I suggest if you have an electronic oven control then that old extended warranty plan is a winner.
Heads Up: One thing you want to remember about fancy electronic controls, never put the stove on self clean! The temperature will cause the delicate electronics to fail. I don't care what anyone says. That stove will get to 900 degrees and adversely affect those controls.
On top of the stove is a series of burners.
8 inch 4 turn Delta stove eye
As you can see they shove into an elelectrical block like this:
330031 receptacle block
These burners use a standard robertshaw generic control which has
5 terminals. L1 and L2 for power into the switch. H1 and H2 goes out to
the stove eye receptacle,and p which connects to a small wire and that wire
is connected to a hot surface indicator light.
HEADS UP: Do not get these wires crossed or when 2 burners are energized
both switches will be burnt to hell and back.
So pay attention to the markings on the switch and do not rely on the pattern.
One more thing: oven door hinges can be a pain in the butt
if a spring breaks but they are not very hard to replace. So stop
using the dining room chair to keep the oven door closed: