mypros+
Error code reference

Midea Washer Error Code E40

EEPROM failed; memory chip of the PCB is broken.

Midea codesMidea washer codes

EEPROM failed; memory chip of the PCB is broken.

First step from the service manual

Replace the PCB.

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

MyPros+ Max

Get the full diagnostic procedure for E40.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E40 means on a Midea washer

The E40 error code on a Midea washer indicates a failure of the EEPROM (Electrically Erasable Programmable Read-Only Memory) chip located on the main PCB (printed circuit board). The EEPROM is a small non-volatile memory chip that stores critical machine configuration data, calibration settings, cycle parameters, and operational history. When the washer's control system cannot read from or write to this chip reliably, it triggers the E40 fault and halts operation to prevent unpredictable behavior.

EEPROM failures are typically hardware-level faults rather than software or wiring issues. The chip itself may have degraded due to voltage spikes, power surges, or simply end-of-life wear from repeated read/write cycles. In some cases, solder joint failures on the PCB can cause intermittent or permanent loss of communication with the memory chip, producing the same E40 code. Because the EEPROM is soldered directly onto the main control board, it is not a component that can be replaced independently in most field repair scenarios.

Since the EEPROM is integral to the PCB assembly, the standard corrective action is full PCB replacement. Attempting to reset or power-cycle the machine will not restore a physically failed memory chip. The new control board will come pre-programmed with the necessary firmware and configuration data, restoring normal washer operation.

Source: manufacturer service documentation.

Common causes of E40

  1. 01

    Failed EEPROM chip on the PCB

    Part replacement

    The EEPROM chip has reached end-of-life or experienced internal failure, making it unable to read or write data. This is the most direct cause of E40 and requires PCB replacement.

  2. 02

    Power surge or voltage spike damage

    Part replacement

    A sudden power surge can corrupt or physically damage the EEPROM chip on the control board. If the error appeared after a power outage or electrical event, surge damage is a likely culprit.

  3. 03

    Failed solder joints on the PCB

    Part replacement

    Cold or cracked solder connections on the PCB can interrupt communication between the main processor and the EEPROM chip, triggering E40. Visually inspect the board for cracked joints or burn marks, though repair typically still requires board replacement.

  4. 04

    General PCB failure

    Part replacement

    Broader control board degradation due to heat, moisture, or age can affect the EEPROM along with other board components. If other error codes have appeared alongside E40, overall board failure is likely.

See the test procedure for each cause

Frequently asked questions about E40

What does E40 mean on a Midea washer?
The E40 code on a Midea washer indicates that the EEPROM memory chip on the main PCB has failed. This chip stores the washer's operating settings and configuration data. When the control board cannot access this memory, it displays E40 and stops functioning. The fix is replacement of the main control board.
Can I fix the E40 error myself on a Midea washer?
If you are comfortable working with appliance electronics and sourcing the correct replacement PCB for your Midea model, you can replace the control board yourself. The repair involves disconnecting the wiring harness connectors from the old board and installing the new one. However, if you are not experienced with appliance electronics, hiring a qualified technician is the safer choice.
Will resetting my Midea washer clear the E40 error?
No, a reset or power cycle will not clear the E40 error. Because the fault is caused by a physically failed EEPROM chip on the control board, the underlying hardware problem remains regardless of how many times the machine is reset or unplugged. The error will return immediately upon startup until the PCB is replaced.
Is it safe to use my Midea washer when it shows E40?
The washer will typically halt operation when E40 is active, so running a wash cycle is not possible in this state. There is no immediate safety hazard such as a fire or flood risk from the E40 code itself, but the machine cannot be used for laundry until the control board is replaced.
How much does it cost to fix the E40 error on a Midea washer?
The cost depends on whether you repair it yourself or hire a technician. A replacement Midea main control board typically costs in the range of $80 to $200 for the part alone, depending on the specific model. If you use a professional repair service, expect to add $100 to $200 or more in labor costs, bringing the total repair estimate to roughly $180 to $400.

Related Midea washer codes

All Midea washer codes
View all 39 Midea washer codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass