mypros+
Error code reference

Jenn-Air Dishwasher Error Code E:20

Reserved error code.

Jenn-Air codesJenn-Air dishwasher codes

Reserved error code.

MyPros+ Max

Get the full diagnostic procedure for E:20.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E:20 means on a Jenn-Air dishwasher

The E:20 code on a Jenn-Air dishwasher is classified as a reserved error code. Reserved codes are placeholders within the control board's firmware that are designated for potential future use or for internal diagnostic functions that are not exposed through normal service documentation. When this code appears, it indicates the control board has logged or triggered a state that maps to this reserved register, but the specific subsystem involved is not publicly defined in standard field service data.

Because E:20 is reserved, its appearance on a running appliance is atypical and may point to a control board anomaly rather than a clear component failure. The control board continuously monitors sensor inputs, motor feedback, door latch status, and water management systems. If internal firmware encounters an unexpected state or a communication error between board components, it may surface a reserved code as a catch-all response. This makes diagnosis less straightforward than with defined error codes.

Practical troubleshooting for this code should begin with a full power reset to determine whether the code clears. If the code persists after resetting, the control board itself is the primary suspect, as no specific sensor or actuator is directly tied to E:20 in available technical data. A technician should inspect wiring harness connections at the control board for corrosion or loose terminals before condemning the board outright.

Source: manufacturer service documentation.

Common causes of E:20

  1. 01

    Control Board Firmware Anomaly

    Part replacement

    The control board may have encountered an unexpected internal state that triggered this reserved code. This is the most likely cause given that E:20 has no defined component association.

  2. 02

    Loose or Corroded Wiring Harness Connection

    Wiring / connection

    A poor connection at the control board's wiring harness can cause irregular signals that the firmware logs as unrecognized or reserved error states. Inspect all connectors at the control board for corrosion, looseness, or damage.

  3. 03

    Transient Power Surge or Voltage Fluctuation

    Wiring / connection

    A brief power anomaly can cause the control board to log unexpected codes. If the error appeared after a power outage or surge, a full reset may resolve it without any hardware replacement.

  4. 04

    Failed or Failing Control Board

    Part replacement

    If the error persists through resets and no wiring issues are found, the control board itself may be failing internally. A failing board can generate reserved or undefined codes as internal memory or logic circuits degrade.

See the test procedure for each cause

Frequently asked questions about E:20

What does E:20 mean on a Jenn-Air dishwasher?
E:20 is a reserved error code on Jenn-Air dishwashers, meaning it is a placeholder in the control board's firmware without a publicly defined cause tied to a specific component. It may indicate a control board anomaly, a wiring issue, or an unexpected internal state. Because it has no standard diagnostic path, troubleshooting starts with a power reset and then focuses on the control board and its wiring connections.
How do I fix the E:20 error on my Jenn-Air dishwasher?
Start by performing a full power reset: turn off the dishwasher at the circuit breaker, wait at least one minute, then restore power. If the code returns, inspect the wiring harness connections at the control board for any loose or corroded terminals. If the code still persists after those checks, the control board likely needs to be replaced by a qualified technician.
Is it safe to use my Jenn-Air dishwasher while it shows E:20?
Because E:20 is a reserved code with no defined meaning, it is not possible to confirm which system may be affected. Running the dishwasher while an unexplained error is active is not recommended, as an underlying control board issue could affect water management or other critical functions. Have the unit inspected before resuming normal use.
Will resetting my Jenn-Air dishwasher clear the E:20 code?
A power reset will clear the code if it was triggered by a transient event such as a power fluctuation. Turn off the breaker for at least one minute and then restore power to attempt a reset. If the code returns after the reset, the underlying cause is persistent and will require further diagnosis.
How much does it cost to repair a Jenn-Air dishwasher showing E:20?
If only a wiring connection needs to be reseated, the repair cost may be limited to a service call fee, typically in the range of $75 to $150. If the control board requires replacement, parts and labor combined can range from $200 to $450 or more depending on the specific model and local labor rates. Getting a diagnostic visit before committing to parts replacement is advisable given the undefined nature of this code.

Related Jenn-Air dishwasher codes

All Jenn-Air dishwasher codes
View all 69 Jenn-Air dishwasher codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass