My Mother has a Kitchenaid electric range (20 yrs old) range top burners work fine but oven doesn't work

http://www.searspartsdirect.com/partsdirect/part-model/Kitchenaid-Parts/Range-Parts/Model-KESC307HBS0/0593/0124160/W0105111/00001?blt=06&prst=0&shdMod=KESC307HBS0 this parts breakdown gives you an idea of what pieces you need to remove to get to the burners. Start off by removed the trim pieces (careful they scratch easily). Then you should be able to raise remove the glass top - careful that you secure it somewhere that it doesn't fall over and break.

It sounds as if the electronic clock/timer has failed and needs replacing. If you don't use the timer and don't need the clock it can be bypassed so that the oven will still work. A repair person should be able to do this fairly easily.

Is there a Manual for this product? Can I download it?

You will need a new igniter module. The igniter module is told to spark by the control panel. There is also a flame detection for electronic start and that could be bad too.

All F3-E Codes - Oven Temperature Sensor (RTD) or Warming Drawer Defect - Replace oven temperature sensor (RTD).

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whirlpool oven wont turn on top burner work.
model #SF315PPQ2

Check to see if the coils are properly connected. If so, you may need to replace the thermostat unit, which monitors the actual oven temperature. Hope this helps.

GAS OR ELECTRIC?

I went to the kitchenaid web site for parts and found a trouble shooting section. I read about how a electronic glow coil works and discovered that mine was just old and did not reach the right voltage to open the gas flow valve.

Sounds like the ignitor in the oven is weak and not building up enough resistance to the gas valve to allow gas to the burner. I would replace the ignitor if it is more than 3 or 4 yrs. old.