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Error code reference

Haier Washer Error Code ErrC

Lost communication between the power board and the display board.

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Lost communication between the power board and the display board.

First step from the service manual

Cut off the power and check the connectors between the display board and the power board.

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

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What ErrC means on a Haier washer

ErrC on a Haier washer indicates a loss of communication between the power board and the display board. These two boards work together continuously during operation: the power board manages motor control, water inlet valves, heating elements, and pump functions, while the display board handles user input and status output. They exchange data signals through a wiring harness with connectors at each end. When that communication link is interrupted or corrupted, the machine cannot safely coordinate its operations and halts with this fault code.

The most common cause of ErrC is a loose, corroded, or disconnected connector in the harness that runs between the two boards. Vibration during spin cycles can gradually work a connector loose over time. In some cases, the wiring harness itself may have a damaged or broken wire that intermittently or permanently disrupts the signal. A failed or damaged display board or power board can also produce this fault if one side is no longer able to send or receive the communication signal properly.

Diagnosis begins with a full power disconnection before inspecting any internal components. Once the machine is unplugged, the technician should locate and firmly reseat all connectors between the display board and the power board, checking for bent pins, corrosion, or signs of heat damage at each connector. If reseating the connectors does not resolve the fault, continuity testing of the wiring harness and functional testing of each board are the next steps.

Source: manufacturer service documentation.

Common causes of ErrC

  1. 01

    Loose or disconnected connector

    Wiring / connection

    The wiring harness connectors between the display board and power board can work loose over time due to vibration. Unplugging the machine and firmly reseating each connector is the first step in diagnosis.

  2. 02

    Damaged wiring harness

    Part replacement

    A wire in the harness between the two boards may be broken, pinched, or chafed, causing intermittent or permanent signal loss. Inspect the harness carefully for visible damage and test continuity across each wire.

  3. 03

    Corroded connector pins

    Wiring / connection

    Moisture inside the cabinet can cause corrosion on the connector pins, increasing resistance and disrupting the communication signal. Look for greenish or white residue on the metal pins at either board connector.

  4. 04

    Failed display board

    Part replacement

    If the display board has failed internally, it can no longer send or receive data from the power board, triggering ErrC. If connectors and wiring check out, the display board should be tested or replaced.

  5. 05

    Failed power board

    Part replacement

    A damaged or failed power board may be unable to maintain the communication link with the display board. This is typically diagnosed after ruling out connector and harness issues and confirming the display board is functional.

See the test procedure for each cause

Frequently asked questions about ErrC

What does ErrC mean on a Haier washer?
ErrC means the washer has detected a loss of communication between the power board and the display board. These two boards must exchange data continuously for the machine to operate safely. When that link is broken, the washer stops and displays ErrC. The fault is typically caused by a loose connector, damaged wiring, or a failed board.
How do I fix ErrC on a Haier washer?
Start by cutting off power to the washer and inspecting the connectors that link the display board and the power board. Firmly reseat any loose connectors and check for bent pins, corrosion, or visible wire damage. If the fault returns after reconnecting power, the wiring harness or one of the two boards may need to be replaced.
Will resetting my Haier washer clear the ErrC code?
Unplugging the washer for a few minutes may temporarily clear the code, but ErrC will return if the underlying communication problem is not resolved. A reset does not fix a loose connector, damaged wire, or faulty board. The physical cause must be identified and corrected to permanently clear the fault.
Is it safe to use my Haier washer when ErrC is displayed?
No, you should not attempt to run the washer while ErrC is active. The machine has halted because it cannot coordinate functions between the control boards, which could lead to unpredictable behavior. Keep the washer powered off until the fault is diagnosed and repaired.
How much does it cost to repair a Haier washer showing ErrC?
Repair costs vary depending on the root cause. If the fix is simply reseating a loose connector, the cost may only be a service call fee, typically in the range of $75 to $150. Replacing a wiring harness or a display board generally adds $100 to $300 or more in parts and labor. Replacing the power board tends to be at the higher end of that range.

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