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Error code reference
Jenn-Air Cooktop Error Code Er 20
Flash failure; microcontroller (μC) is faulty.
SourceJennAir Downdraft Cooktop - Full Service Manual (W11546679)p. 2-3
Diagnostic procedure
The full Er 20 procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Disconnect power, replace the cooktop UI board, reassemble all parts and panels before operating.
SourceJennAir Downdraft Cooktop - Full Service Manual (W11546679)p. 2-3
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented
1 manual in the MyPros+ library documents this code for Jenn-Air cooktop.
Models covered by the manuals that document this code
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