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Error code reference

AEG Washer Error Code E33

Incongruence between pressure switch level 1 and dry run protection 1 (error must persist more than 3 sec).

AEG codesAEG washer codes

Incongruence between pressure switch level 1 and dry run protection 1 (error must persist more than 3 sec).

First step from the service manual

Replace pressure switch.

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

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What E33 means on a AEG washer

Error code E33 on an AEG washer indicates a conflict between the pressure switch level 1 signal and the dry run protection 1 signal. The pressure switch (also called a water level sensor or pressostat) monitors water levels inside the drum by detecting air pressure changes in a connected air chamber. The dry run protection system uses a separate sensing input to confirm that water is present before allowing the motor and heating elements to operate. When these two signals disagree for more than 3 consecutive seconds, the control board flags E33 and halts operation to prevent pump or element damage.

The most direct cause of this error is a failed or miscalibrated pressure switch that sends an inaccurate water level reading. However, the conflict can also arise from a blocked or kinked pressure hose connecting the air chamber to the switch, air leaks in that hose, or a clogged air trap chamber that produces incorrect pressure readings. In some cases, wiring faults between the pressure switch and the control board, such as damaged connectors or broken leads, can cause intermittent or incorrect signal transmission that triggers the incongruence.

Because the error must persist for more than 3 seconds before it is registered, brief transient fluctuations during filling or draining are filtered out. A persistent E33 almost always points to a hardware fault in the pressure sensing circuit rather than a temporary condition. Diagnostic priority should start with the pressure switch itself, as directed, but a thorough inspection of the associated air hose and connections is equally important before condemning the switch.

Source: manufacturer service documentation.

Common causes of E33

  1. 01

    Faulty pressure switch

    Part replacement

    The pressure switch itself has failed internally and is sending a signal that does not match the dry run protection input. Replacing the pressure switch is the primary recommended diagnostic step and resolves the error in most cases.

  2. 02

    Blocked or kinked pressure hose

    Wiring / connection

    The small hose connecting the air trap chamber to the pressure switch can become kinked, clogged with residue, or partially disconnected. Inspect the hose along its full length for obstructions, kinks, or loose connections at either end.

  3. 03

    Clogged air trap chamber

    Wiring / connection

    The air trap or air dome at the base of the drum can accumulate detergent residue or debris, preventing accurate pressure transmission to the switch. Detaching and cleaning the chamber can restore correct sensor readings.

  4. 04

    Damaged wiring or connectors in the pressure sensing circuit

    Wiring / connection

    Corroded, broken, or loose wiring between the pressure switch and the main control board can cause intermittent or incorrect signals that produce the level 1 versus dry run protection incongruence. Check connector pins and wire insulation for visible damage.

  5. 05

    Failed main control board

    Part replacement

    If the pressure switch, hose, air trap, and wiring all check out correctly, the control board may be misinterpreting or failing to process the sensor signals. This is the least likely cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about E33

What does E33 mean on a AEG washer?
E33 indicates an incongruence between the pressure switch level 1 signal and the dry run protection 1 signal that persists for more than 3 seconds. These are two separate inputs the control board uses to confirm water is present in the drum. When they disagree, the machine stops to protect the motor and heating elements from running dry. The fault most commonly points to a failed pressure switch or a problem in the pressure sensing circuit.
Can I fix E33 on my AEG washer myself?
Some causes, such as a kinked pressure hose or a clogged air trap, can be addressed without replacing parts if you are comfortable accessing the interior of the machine. However, the primary recommended fix is replacing the pressure switch, which requires identifying the correct replacement part and basic appliance repair skills. If you are not confident working inside the washer, a qualified technician should handle the repair to avoid further damage.
Is it safe to use my AEG washer when E33 is showing?
No, you should not continue running the washer while E33 is active. The error code triggers a halt specifically to prevent dry running of the pump and heating element, which can cause serious internal damage. Running the machine in this state risks burning out components and could turn a simple sensor repair into a much more costly fix.
How much does it cost to repair AEG washer error E33?
If the repair only requires clearing a blocked hose or air trap, the cost may be minimal, covering only a service call in the range of $75 to $150. If a pressure switch replacement is needed, parts typically range from $20 to $60, with total repair costs including labor generally falling between $100 and $220. A control board replacement, if required, would be significantly more expensive, often $200 to $400 or more depending on the model.
Will resetting my AEG washer clear the E33 error?
A power reset may temporarily clear the error code from the display, but E33 will return if the underlying hardware fault is not corrected. Because the error only registers after the signal conflict persists for more than 3 seconds, any reset is only a surface-level fix. The pressure switch and associated components need to be inspected and repaired to prevent the code from reappearing.

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