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Error code reference

Jenn-Air Cooktop Error Code Er 20

Flash failure; microcontroller (μC) is faulty.

Jenn-Air codesJenn-Air cooktop codes
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What the Er 20 error code actually means

Er 20 means the cooktop's main control board has developed an internal failure in its memory chip, and the cooktop can no longer operate normally. This is not a problem you can fix by resetting the unit. The control board needs to be replaced by a technician to restore normal cooktop function.

Diagnostic procedure

The full Er 20 procedure

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1
First diagnostic step
Disconnect power, replace the cooktop UI board, reassemble all parts and panels before operating.
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Most common causes of Er 20

Ranked by how often they cause this code
  1. 1Faulty UI board microcontroller
  2. 2Firmware corruption from power interruption
  3. 3Power surge or voltage spike damage
  4. 4Component degradation over time

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Questions people ask about Er 20

What does Er 20 mean on a Jenn-Air cooktop?
Er 20 indicates a flash failure in the cooktop's microcontroller, which is located on the user interface (UI) board. The microcontroller's internal flash memory has become corrupted or failed, preventing normal operation. This fault requires replacing the UI board to resolve.
Will resetting the cooktop clear the Er 20 error?
Disconnecting power and waiting before restoring it is the first recommended step, but Er 20 is caused by an internal hardware failure in the microcontroller. A simple reset is unlikely to clear the fault permanently. If the error returns after a power reset, the UI board requires replacement.
How much does it cost to repair a Jenn-Air cooktop showing Er 20?
Repair costs vary depending on the specific cooktop model and labor rates in your area. The UI board part itself typically ranges from $150 to $350 or more, and professional labor can add $100 to $250 on top of that. Diagnosing the fault and sourcing the correct board for your model number before ordering is recommended.
Can I fix Er 20 on my Jenn-Air cooktop myself?
The repair involves disconnecting power to the cooktop and replacing the UI board. A knowledgeable DIYer comfortable working with appliance electronics can perform this replacement, but it does require sourcing the correct UI board for your specific model. Reassemble all parts and panels fully before restoring power and testing.
Is it safe to use my Jenn-Air cooktop while Er 20 is displayed?
You should not continue using the cooktop while Er 20 is active. The microcontroller fault means the control system cannot reliably manage burner output or respond to user inputs. Operating the cooktop in this state could pose a safety risk.

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