Why doesn't my double burner work?

First, try to light the burner in question with a match. Just hold a match to the burner, then turn the gas on to low. If the burner doesn`t light, the problem is the gas supply to the burner. Next, lift the top cover and put the prop rod in the hole in the cover to support it. Hold a match to the left-front burner. Now, turn the control knob to "light". You should see the igniter spark and hear a snap. If this doesn`t happen, repeat this step with the left rear burner. If you hear the spark and snap.
If the igniter doesn`t work on the front left burner, but does on the rear left burner, the igniter does work. The problem is likely the control knob for the left front burner. The. Control knob includes the electrical switch the activates the igniter when you turn on that burner.

The temperature sensor located on the that element is failing. the sensor red light reminds you that the burner area is still hot. The light should go out once the glass top has cooled,but the failing sensor won't allow it. A slight rap with your hand on glass top over that burner once cool will put the light out. It more than likely continue until the unit is replaced.

What is the model number of your unit?

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.

You either have a bad element or bad controller. They are available here Search Over 2 1 Million Appliance Parts

Replace the switch for that burner. (the shaft of the switch has the burner temp knob on it)

there are 3 screws under the front of the top with the oven door open actually there are 6 screws but only 3 you need to remove to raise the glass top up!! to service the burners

check the burner socket, it is likely that contact is being lost where the burner connects to the hardwired portion of the system (the socket). It is not unusual for the socket to "burn up" when there is a poor connection to the burner resulting in the burner being replaced and the new burner not working or working intermittently.

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SOUNDS LIKE YOU MAY HAVE A WIRE BURNED. CAN YOU USE A MUTIMETER?

Look at the back of your range there should be schemetic for your power control board. look for defective burner wire going into relay. There should be 5 relays in rows. Realy is the problem. I had the same problem with my front left burner stuck on high.
After replacing everything works okay.