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Error code reference

Continental Washer Error Code A-04

Failure of inverter relay K-2

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Failure of inverter relay K-2 – The inverter does not recognize that the relay is closed on the microprocessor board.

First step from the service manual

Check connections on the inverter at points CM and X2; ensure they are tight and free of contaminants, red wire on CM and black wire on X2.

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

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What A-04 means on a Continental washer

The A-04 error code on a Continental washer indicates a failure of inverter relay K-2, specifically a condition where the inverter circuit cannot confirm that relay K-2 on the microprocessor board has successfully closed. The inverter uses feedback signals to verify that control relays have energized and made contact. When this confirmation signal is absent or out of range, the control board flags A-04 and halts operation to prevent running the motor drive circuit in an uncontrolled state.

The inverter communicates with the microprocessor board through connection points labeled CM and X2. The CM terminal carries the red wire and the X2 terminal carries the black wire. Loose, corroded, or contaminated connections at either of these points can interrupt the feedback signal between the inverter and the microprocessor board, causing a false or genuine relay failure reading. This is why the first diagnostic step targets these specific connection points before assuming component failure.

Beyond wiring connections, the fault can originate from a failed relay K-2 itself, a damaged microprocessor board that is not sending or receiving the correct signal, or a faulty inverter unit that cannot properly drive or read the relay state. Because the inverter and the microprocessor board work together to confirm relay status, faults in either component can produce this code. Methodical testing starting at the CM and X2 connections and moving inward toward the relay and control boards is the correct diagnostic approach.

Source: manufacturer service documentation.

Common causes of A-04

  1. 01

    Loose or contaminated connections at CM and X2

    Wiring / connection

    Poor contact at the CM terminal (red wire) or the X2 terminal (black wire) on the inverter can break the feedback signal between the inverter and microprocessor board. Inspect these connections first, reseating and cleaning them if any corrosion, moisture, or debris is present.

  2. 02

    Failed inverter relay K-2

    Part replacement

    The relay K-2 itself may have failed mechanically or electrically and is not closing when commanded. A failed relay will need to be replaced to restore proper inverter control.

  3. 03

    Faulty microprocessor board

    Part replacement

    If the microprocessor board cannot send the proper relay-close command or cannot read the feedback signal, it will trigger A-04 even if the relay and wiring are intact. Board-level damage from voltage spikes or moisture can cause this condition.

  4. 04

    Faulty inverter unit

    Part replacement

    The inverter itself may be unable to drive relay K-2 or process the relay status feedback correctly. If connections and the relay check out, the inverter unit should be tested and may require replacement.

  5. 05

    Damaged wiring harness between inverter and microprocessor board

    Wiring / connection

    Chafed, broken, or shorted wiring along the harness connecting the inverter to the microprocessor board can interrupt the relay feedback signal. Visually trace the harness and test for continuity to rule this out.

See the test procedure for each cause

Frequently asked questions about A-04

What does A-04 mean on a Continental washer?
The A-04 code indicates a failure of inverter relay K-2, meaning the inverter is not receiving confirmation that this relay has closed on the microprocessor board. The control system halts operation when it cannot verify the relay state. The first place to check is the wiring connections at the CM and X2 terminals on the inverter, using the red wire on CM and the black wire on X2 as reference points.
Can I fix the A-04 error myself on a Continental washer?
A homeowner with basic electrical knowledge can start by inspecting and reseating the connections at the CM and X2 terminals on the inverter, checking for loose, corroded, or dirty contacts. If cleaning and securing the connections does not resolve the code, diagnosing a failed relay, inverter, or microprocessor board requires component-level testing and is best handled by a qualified appliance technician.
Will resetting the washer clear the A-04 error code?
Resetting the washer may temporarily clear the A-04 code, but if the underlying fault is still present, the code will return once the machine attempts to operate again. A reset is not a fix. The root cause, whether a poor connection, failed relay, or faulty board, must be identified and corrected for the washer to operate normally.
Is it safe to use my Continental washer when the A-04 code is showing?
The washer will typically stop operation when A-04 is active, which is a protective measure to prevent running the motor drive system in an uncontrolled state. You should not attempt to force the machine to run while this fault is present. Leave the washer unpowered until the fault has been diagnosed and repaired.
How much does it cost to repair a Continental washer with an A-04 error?
Repair costs vary depending on the failed component. If the fix is simply reseating or cleaning the connections at CM and X2, costs may be limited to a service call fee, typically in the range of $75 to $150. Replacing relay K-2, the inverter, or the microprocessor board will add parts costs, and total repair costs for component replacement can range from $150 to $500 or more depending on parts availability and labor rates in your area.

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