I thought it was the burner thermostat, so I replaced the burner unit. By coincidence, the ceramic outer portion of the burner was cracked in two places, but otherwise intact. That was not the problem, though since the new burner did the same thing as the old one. Then I new it was the Infinite Control Switch, so I ordered it. Replacing it was easy. I turned off the cooktop circuit breaker and made sure no power was going to it. It is powered by 240 volts so you need to be very careful to turn off the power before doing any servicing on it. I then carefully pried up the glass cooktop and lifted it out, so it wouldn't break. By taking off the control knobs, and removing several small Phillips head screws all around the metal cooktop frame and just under the edge of the glass cooktop, I could lift the glass top off from the cooktop, and place it on some newspaper so it didn't get broken. It is important to keep the rest of the cooktop upright. The burners are not fastened down, and only gravity holds them in place. They normally sit on two springloaded pins, one on each side, and the weight of the glasstop pushes them down to their proper setting. So don't mess with them, and make sure each side remains on the two pins after you're done and before putting the glasstop back on. As for the switch, you need to remove two small 1/4 inch metal screws (a socket is very handy for this), one on each side of a metal framework that holds all the switches. After removing that framework, I carefully turned it over and found the correct switch for the burner that wasn't working. In my case, it was the closest right hand burner, which is also the biggest and has the option of having a big, small or both elements turned on, depending on how you turn the control switch. I then carefully pulled off each wire lead, with a needlenose plier to avoid damaging them, and immediately put each wire onto the corresponding same connection on the new switch. Take a close look at the wires on the old switch to make sure you plug them into the same connectors on the new switch. It's pretty straightforward. There may have been one or two small screws holding the switch onto the framework, but I don't recall right now. It was very easy to see how to remove and then reattach it. Then reverse the above steps and reinstall the cooktop, turn on the power and you should be in business!
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