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Error code reference

AEG Washer Error Code E43

Measurement circuit of door lock always 0V or 5V.

AEG codesAEG washer codes

Measurement circuit of door lock always 0V or 5V.

First step from the service manual

Replace electronics.

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

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What E43 means on a AEG washer

Error code E43 on an AEG washer indicates a fault in the measurement circuit of the door lock (also called the door interlock or door latch assembly). Specifically, the control board is detecting that the signal voltage from the door lock circuit is fixed at either 0V or 5V continuously, rather than transitioning between states as it should during normal operation. A properly functioning door lock circuit produces a changing voltage signal as the lock engages and disengages. When the signal is stuck at one of these two extremes, the electronics cannot confirm the door lock status and triggers E43 to prevent the machine from operating in a potentially unsafe condition.

The measurement circuit for the door lock relies on communication between the door interlock component and the main control board (PCB). If the wiring harness between the door lock and the PCB is shorted to ground or to the supply voltage, the signal line will read a fixed 0V or 5V respectively. A failed door lock solenoid or position sensor within the interlock assembly can also cause the signal to become fixed. Additionally, if the control board itself has a damaged input circuit for the door lock measurement, it will misread or fail to read the signal entirely.

Because the first recommended diagnostic step is to replace the electronics (the main control board), this fault is typically interpreted as originating within the PCB's measurement input circuitry rather than in the door lock wiring or the interlock component itself. However, a thorough diagnosis should confirm that the wiring harness shows no shorts and that the door lock assembly is not the root cause before committing to a board replacement.

Source: manufacturer service documentation.

Common causes of E43

  1. 01

    Failed main control board (PCB)

    Part replacement

    The measurement input circuit on the PCB that reads the door lock signal can fail, causing it to read a fixed 0V or 5V. This is the primary suspect indicated by the diagnostic guidance to replace the electronics.

  2. 02

    Faulty door lock assembly (interlock)

    Part replacement

    The door interlock contains internal sensors that generate the voltage signal read by the control board. If the interlock's internal sensor or solenoid has failed, the signal line can become stuck at a fixed voltage.

  3. 03

    Short circuit in the door lock wiring harness

    Wiring / connection

    A wiring harness that is shorted to ground or to the 5V supply rail will hold the measurement circuit at 0V or 5V respectively. Inspect the wiring between the door lock and the PCB for pinched, chafed, or melted insulation.

  4. 04

    Loose or corroded connector at the door lock or PCB

    Wiring / connection

    A poor connection at either end of the door lock circuit can cause the signal line to float to a fixed rail voltage. Check and reseat all connectors involved in the door lock circuit.

See the test procedure for each cause

Frequently asked questions about E43

What does E43 mean on a AEG washer?
E43 means the measurement circuit monitoring the door lock is reading a fixed voltage of either 0V or 5V, when it should be producing a changing signal. This prevents the washer from confirming the door is securely locked. The machine stops operation as a safety measure until the fault is resolved.
Can I fix E43 on my AEG washer myself?
Some causes, such as a loose connector or a damaged wiring harness, can be addressed by a confident DIYer with basic electrical knowledge. However, the primary recommended fix involves replacing the main control board or the door lock assembly, which requires disassembly of the washer and comfort working with electrical components. If you are not experienced with appliance repair, it is advisable to call a qualified technician.
Will resetting my AEG washer clear the E43 error?
A reset may temporarily clear the error display, but because E43 points to a hardware fault in the door lock measurement circuit, the code will return as soon as the washer attempts to lock the door again. A reset is not a fix and the underlying component issue must be addressed before the machine will operate reliably.
Is it safe to use my AEG washer while E43 is showing?
No. E43 indicates the control board cannot confirm the door lock status, which is a critical safety circuit. Running the washer without a confirmed door lock could result in the door opening during a cycle, causing water damage or injury. The machine should remain out of service until the fault is repaired.
How much does it cost to repair an AEG washer E43 error?
Repair costs depend on the root cause. Replacing the main control board typically costs between $150 and $350 for the part alone, with additional labor costs if a technician is hired. A door lock assembly replacement is generally less expensive, ranging from $30 to $90 for the part. A wiring harness repair by a technician may fall in the $80 to $180 range depending on the extent of the damage.

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