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Error code reference

Haier Washer Error Code Err9

Lost communication between the Display board and Touch board.

Haier codesHaier washer codes

Lost communication between the Display board and Touch board.

First step from the service manual

Check if connectors between the Display board and Touch board are connected well.

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

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What Err9 means on a Haier washer

Err9 on a Haier washer indicates a loss of communication between the display board and the touch board. These two boards work together to manage user input and machine feedback: the touch board registers button presses and sends commands, while the display board interprets those signals and communicates operational status back to the user. When the data signal between them is interrupted or absent, the washer logs Err9 and typically halts operation to prevent uncontrolled behavior.

The most common trigger for this fault is a loose, damaged, or improperly seated connector on the ribbon cable or wiring harness that links the two boards. Vibration during normal wash cycles can gradually loosen connectors over time. In some cases, the connector may appear attached but have bent or corroded pins that prevent reliable signal transmission. Physical inspection of both connector ends is the recommended starting point before assuming either board has failed.

If the connectors are confirmed secure and undamaged, the fault may point to a failure on one of the boards themselves. A failed communication IC, damaged trace on the PCB, or moisture intrusion can all disrupt the data link between the display and touch boards. In these situations, one or both boards will need to be tested and potentially replaced. Because the display board and touch board are separate components, a technician can often isolate which board is responsible by substitution testing.

Source: manufacturer service documentation.

Common causes of Err9

  1. 01

    Loose or disconnected wiring harness connector

    Wiring / connection

    The connector linking the display board and touch board may have come loose due to vibration over time. Inspect both ends of the connector carefully and reseat them firmly.

  2. 02

    Damaged or corroded connector pins

    Wiring / connection

    Even when a connector appears attached, individual pins can be bent, corroded, or dirty enough to break the signal path. Look closely at both connector ends for visible pin damage or oxidation.

  3. 03

    Faulty ribbon cable or wiring harness

    Part replacement

    The cable running between the two boards may have a break or damaged section caused by pinching, abrasion, or repeated flexing. A damaged cable will need to be replaced.

  4. 04

    Failed touch board

    Part replacement

    If connections are intact and the cable is undamaged, the touch board itself may have a failed communication component. Substitution testing with a known-good board can confirm this.

  5. 05

    Failed display board

    Part replacement

    A defective display board can also break the communication link. Moisture intrusion or a damaged PCB trace on the display board may prevent it from receiving or sending signals correctly.

See the test procedure for each cause

Frequently asked questions about Err9

What does Err9 mean on a Haier washer?
Err9 means the washer has detected a loss of communication between the display board and the touch board. These two internal control boards must exchange signals continuously for the machine to operate. When that signal is lost, the washer stops and displays Err9 to alert you to the problem.
How do I fix Err9 on my Haier washer?
Start by unplugging the washer and locating the connectors between the display board and touch board. Reseat both ends of the connector firmly and inspect the pins for damage or corrosion. If the connections are secure and the error returns, the wiring harness or one of the boards may need to be replaced.
Will resetting my Haier washer clear the Err9 code?
A reset may temporarily clear the error, but if the underlying connection problem is still present, Err9 will return once the washer tries to operate again. A reset is useful for confirming whether the fault is intermittent, but it does not fix the root cause.
Is it safe to use my Haier washer when Err9 is displayed?
You should not attempt to run the washer while Err9 is active. The machine has halted because its control boards cannot communicate reliably, which means inputs from the control panel may not be processed correctly. Continuing to use the washer in this state could lead to unpredictable behavior.
How much does it cost to repair an Err9 error on a Haier washer?
If only a connector needs to be reseated, there may be no parts cost at all. Replacing a wiring harness typically falls in the range of $20 to $80 for parts. If a display board or touch board needs replacement, parts and labor combined can range from $100 to $300 or more depending on the specific model and service rates in your area.

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