Potential Causes of Security ID Mismatch (EC:21) Error

• Incorrect Code: The most likely cause is that the security code you entered on the control panel (if applicable) doesn't match the security code embedded on the chip card.
• Corrupted Card Data (Less Likely): In rare cases, the data on the chip card itself might be corrupted, preventing the control board from verifying the security code.

Troubleshooting Steps

1. Double-Check the Security Code: Carefully re-enter the security code on the control panel, ensuring you match the numbers exactly as they appear on the chip card (if applicable to your washer model).
2. Try a Different Card (Optional): If you have another compatible card, try using it to see if the washer can read it and verify the security code. This helps isolate if the problem is with the specific card you were using.

What to Avoid

• Multiple Incorrect Attempts: Avoid entering incorrect security codes repeatedly, as some systems might lock you out after exceeding a specific number of attempts.

If the Error Persists

• Consult Speed Queen Support: If the error persists even after trying a different card (if applicable), contacting Speed Queen's customer support is highly recommended. They can provide further guidance on your specific washer model, the card reader functionality, and potential solutions. They might be able to reset any lockouts or offer suggestions specific to your situation.
• Consider Service Technician (if applicable): In some washer models, the security code might be pre-programmed or require specific actions to reset. If Speed Queen support suggests this and you're not comfortable with the process, consider consulting a qualified appliance repair technician.

By following these steps, you can potentially address the security ID mismatch error (EC:21) on your Speed Queen washer. If the issue persists or your washer model requires specific actions to reset the security code, consult Speed Queen support or consider a qualified technician for further assistance.