Just replaced infinite switch part # 12002125 on Jenn-aire JED8430 cooktop. Now burner will only come on HIGH and does not cycle.

Hello, Thank you for your post. Sounds like your having a problem with one of the burners on your cooktop. Yes, you can have this fixed. The burner that stays on high has a bad infinite switch. Once you change out that switch your cooktop will work as normal.

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This is usually the infinite switch has failed. They are easy to check and inexpensive. Here is a video that will walk you thru testing an infinite switch. It may be a different model but the testing will be the same. You can also enter your model # for diagrams and illustrations for your specific model. Not all models are available. All parts come with installation instructions.

The part you need to replace is the switch. The switch is housed under the top and connects to the dial you are turning.
The switch for the dual burner is 12002125, and 74011242 for the single burner.

The single burner switch runs about $20.00 and the dual runs about $50.00 for the parts

I think that one or more of your infinite switches have shorted and need to be replaced.

For an exploded view of the unit check out
http://www.appliancepartspros.com/partsearch/model.aspx?model_id=47639&diagram_id=681565#d681565

For details on how to replace the switches, check out my other posts

This would be a faulty switch. Hope this helps!

This is for the glass top units. well i'm not sure if your problem is with your large or small single burner or the large expandable burner. If it's the large or small single burner replace the burner and if it the expandable also replace the burner. If you have a coil burner replace the infinite switch. Good luck hope this helps you.

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you can find the schematics, diagrams and parts here at this site . just enter the complete model number that is written on the stove sticker and access the info
http://www.searspartsdirect.com/partsdirect/index.action?sid=PSHx20080204x00001a




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I had the same problem. Mine was caused by liquid seeping into the infinite switch (the switch that gets rotated by the knob to set burner temperature). This caused one of the live wires to short to ground within the switch. Bad Design IMHO. Replacing the switch fixed the problem (you can get replacement parts at Searspartsdirect.com - search using the cooktop model number). To get at the switch you need to remove the top by taking off only the top row of screws all around the unit and also in the down draft cavity.

It's an ignition switch. don't change the burner cartridge.

The switch under that knob is bad.  It's called an infinite switch.  As far as the elements go, first thing to check is for proper voltage (220) to the cooktop.  Let me know what you find.