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Error code reference

AEG Washer Error Code E39

Measurement circuit of pressure switch level 1 always 0V or 5V.

AEG codesAEG washer codes

Measurement circuit of pressure switch level 1 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 E39 means on a AEG washer

Error code E39 on an AEG washer indicates a fault in the measurement circuit of the pressure switch at level 1. The pressure switch, also called a water level sensor or pressure transducer, monitors the water level inside the drum by detecting air pressure changes in a small hose connected to the tub. The control board reads a voltage signal from this circuit that should vary between 0V and 5V depending on the water level. When the board detects the signal is stuck permanently at either 0V or 5V, rather than fluctuating as expected during operation, it registers E39 and halts the cycle.

A signal fixed at 0V typically points to an open circuit condition, such as a broken wire, disconnected connector, or failed sensor that cannot produce any output. A signal fixed at 5V usually indicates a short circuit or a sensor that is saturated and outputting maximum voltage regardless of actual water level. Both conditions prevent the machine from accurately knowing how much water is in the drum, which is a critical safety and operational requirement.

Because the first prescribed diagnostic step is to replace the electronics control board, the root cause in many cases is traced to the main PCB rather than the pressure switch itself. However, wiring harness integrity and the pressure switch sensor should be inspected before committing to a board replacement. A faulty connection or damaged wire between the pressure switch and the control board can produce the same stuck-voltage symptom and is a less costly fix.

Source: manufacturer service documentation.

Common causes of E39

  1. 01

    Failed main control board

    Part replacement

    The PCB may have a damaged measurement circuit that misreads or cannot process the pressure switch signal, causing it to register a permanent 0V or 5V reading. This is the primary suspect according to the diagnostic guidance for E39.

  2. 02

    Faulty wiring or disconnected connector

    Wiring / connection

    A broken wire or loose connector between the pressure switch and the control board can interrupt or short the signal line, producing a stuck voltage reading. Inspect the harness along its full length and reseat all connectors at both ends.

  3. 03

    Defective pressure switch

    Part replacement

    The pressure switch itself may have failed internally, outputting a constant voltage rather than a variable signal that reflects actual water level. Testing the switch with a multimeter and applying gentle air pressure can confirm whether it responds correctly.

  4. 04

    Blocked or kinked pressure hose

    Wiring / connection

    The small rubber hose connecting the tub to the pressure switch can become clogged with detergent residue or kinked during servicing, preventing pressure changes from reaching the switch and causing an abnormal signal. Inspect and clear the hose as part of diagnosis.

See the test procedure for each cause

Frequently asked questions about E39

What does E39 mean on a AEG washer?
E39 means the measurement circuit for the level 1 pressure switch is producing a signal that is permanently stuck at either 0V or 5V. The pressure switch is responsible for monitoring the water level inside the drum, and a stuck signal means the machine cannot determine how much water is present. AEG washers display this code and stop operation to prevent unsafe water level conditions.
Can I fix E39 myself or does it require a technician?
Some causes of E39, such as a loose wiring connector or a blocked pressure hose, can be inspected and addressed by a capable DIYer comfortable working inside the machine. However, if the control board or pressure switch needs replacement, the job involves electrical components and precise reassembly, which many homeowners prefer to leave to a qualified technician. Always disconnect the machine from power before opening the cabinet.
Will resetting the washer clear the E39 error?
A power reset may temporarily clear the display, but E39 will return as soon as the machine runs through its water fill cycle if the underlying fault remains. Because the error reflects a hardware or wiring condition rather than a temporary glitch, a reset alone is not a fix. The pressure switch circuit needs to be diagnosed and repaired for the error to stay clear.
Is it safe to use my AEG washer while it is showing E39?
No, you should not continue using the washer while E39 is active. The machine cannot accurately monitor water levels, which creates a risk of overfilling and potential water damage to your home. The washer typically halts its cycle for this reason, and operating it manually to bypass the error is not recommended.
How much does it cost to repair an AEG washer with error code E39?
Repair costs depend on the root cause. Clearing a blocked pressure hose or reseating a connector costs little to nothing beyond your time. A replacement pressure switch typically runs in the range of $20 to $60 for the part. A new main control board is the most expensive scenario, with parts generally ranging from $80 to $200 or more, plus labor if a technician is involved.

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