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Error code reference

Speed Queen Washer Error Code EC:27

Diagnostic test card write failure indicating faulty card reader.

Speed Queen codesSpeed Queen washer codes

Diagnostic test card write failure indicating faulty card reader.

First step from the service manual

Replace card reader.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What EC:27 means on a Speed Queen washer

EC:27 on a Speed Queen washer indicates a diagnostic test card write failure. This error is generated when the control system attempts to write data to the card reader during a diagnostic cycle and the operation fails. The card reader is a hardware interface used in commercial and laundromat-style Speed Queen units to process payment cards or loyalty cards, and the control board communicates with it during self-test routines to confirm that read and write functions are operating correctly.

When the write test fails, the control board logs EC:27 and flags the card reader as faulty. This can result from internal failure of the card reader module itself, corrupted firmware within the card reader, damaged wiring or connectors between the card reader and the control board, or physical damage to the card reader's internal components from moisture, debris, or normal wear.

Because the first diagnostic step is direct replacement of the card reader rather than a wiring inspection, the failure is typically localized to the card reader module itself. Technicians should inspect the card reader's wiring harness and connector pins for corrosion or mechanical damage before replacement, but in most cases the card reader unit will need to be swapped out to resolve the fault and allow the washer to return to normal operation.

Source: manufacturer service documentation.

Common causes of EC:27

  1. 01

    Failed card reader module

    Part replacement

    The card reader's internal components have failed and can no longer complete a write operation during diagnostics. This is the most common cause and replacement of the card reader module is the primary recommended fix.

  2. 02

    Corroded or damaged wiring connector

    Wiring / connection

    Moisture or physical wear on the connector between the card reader and control board can disrupt communication and cause write failures. Inspect the harness and connector pins for corrosion, bent pins, or loose connections.

  3. 03

    Damaged wiring harness

    Part replacement

    A broken or shorted wire in the harness running to the card reader can prevent proper data transmission during the write test. Visually trace the harness for cuts, pinches, or burn marks.

  4. 04

    Corrupted card reader firmware

    Part replacement

    In some cases the card reader's onboard firmware may become corrupted, causing the write test to fail even if the hardware is physically intact. This typically still requires replacement of the card reader unit.

See the test procedure for each cause

Frequently asked questions about EC:27

What does EC:27 mean on a Speed Queen washer?
EC:27 means the washer detected a diagnostic test card write failure. During a self-test routine, the control system attempted to write data to the card reader and the operation did not complete successfully. This error code points directly to a faulty card reader that needs to be replaced.
Can I fix EC:27 on my Speed Queen washer myself?
A knowledgeable technician or experienced DIYer can resolve EC:27 by first inspecting the card reader wiring harness and connectors for visible damage or corrosion. If the wiring looks intact, the card reader module itself will need to be replaced. Working with the washer's electrical components requires disconnecting power before starting any repairs.
Is it safe to use my Speed Queen washer while EC:27 is displayed?
EC:27 relates to the card reader system rather than the motor, water, or drum components, so the washer may still complete cycles in some cases. However, operating a machine with an active fault code is not recommended, as the card reader failure may prevent proper payment processing or cause the machine to lock out entirely.
How much does it cost to repair EC:27 on a Speed Queen washer?
Repair costs depend on whether the issue is limited to wiring or requires a full card reader replacement. Card reader module parts typically range from around $50 to $200 or more depending on the specific model. Adding professional labor, total repair costs can range from roughly $100 to $350 or higher.
Will resetting my Speed Queen washer clear the EC:27 error code?
A simple power reset is unlikely to permanently clear EC:27 because the error is triggered by an actual write failure during diagnostics rather than a temporary glitch. The code will return the next time the washer runs its diagnostic routine if the underlying card reader fault has not been corrected. The card reader must be repaired or replaced to resolve the error properly.

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