You may have a faulty switch (high resistance). Isolate the cooker from the mains input, ie switch off at the breaker and measure the restance from the incoming live terminal on the back of the cooker to the oven element with the oven switch on , you should get 0 to say 1 ohms, make sure you are reading the live terminal on the element or you will read through the element and get a reading of say 30 ohms anything higher and you have a bad switch. this can happen when a element blows as it puts a high current through the switch assembly
alistair, November 2010