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Error code reference

Electrolux Washer Error Code E31

Electronic pressure switch failure

Electrolux codesElectrolux washer codes

Electronic pressure switch failure - frequency out of acceptable limits (44.676-36.130 Hz) for at least 5 seconds.

First step from the service manual

Check electronic pressure switch, wiring, or main board.

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

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What E31 means on a Electrolux washer

The E31 error code on an Electrolux washer indicates a failure in the electronic pressure switch, specifically that the switch's output frequency has fallen outside the acceptable operating range of 36.130 to 44.676 Hz for a continuous period of at least 5 seconds. The electronic pressure switch (also called a pressure sensor or water level sensor) uses frequency output rather than simple on/off switching to communicate water level information to the main control board. When the frequency drifts beyond these defined limits, the control board interprets this as a sensor malfunction and halts operation to prevent overfilling or incorrect cycle behavior.

The pressure switch works by converting air pressure from a small tube connected to the wash tub into a frequency signal. As the water level rises, air pressure in the tube increases, which shifts the sensor's output frequency within a calibrated range. If the frequency reading falls below 36.130 Hz or rises above 44.676 Hz and holds there for 5 or more seconds, the board triggers E31. This can result from a faulty pressure switch generating an erratic or out-of-range signal, a clogged or kinked air pressure hose feeding incorrect pressure data to the sensor, or a damaged wiring harness causing signal degradation between the switch and the control board.

Diagnosis should begin with a visual inspection of the pressure switch wiring and connectors for corrosion, loose pins, or chafing. The air pressure hose should be checked for blockages, cracks, or disconnections. If wiring and hose are intact, the pressure switch itself is the most likely failed component. In some cases, a malfunctioning main control board may misinterpret a valid sensor signal, though this is a less common cause.

Source: manufacturer service documentation.

Common causes of E31

  1. 01

    Faulty electronic pressure switch

    Part replacement

    The pressure switch itself may have failed internally, causing it to produce a frequency signal outside the 36.130 to 44.676 Hz range. Replacing the sensor is typically required if the hose and wiring check out as intact.

  2. 02

    Clogged or kinked air pressure hose

    Wiring / connection

    The small hose that connects the wash tub to the pressure switch can become clogged with detergent residue or kinked, feeding incorrect pressure data to the sensor and pushing its frequency output out of range. Inspect the hose for blockages, bends, or disconnections.

  3. 03

    Damaged or loose wiring harness

    Wiring / connection

    Corroded connectors, loose terminals, or chafed wiring between the pressure switch and the main control board can degrade the frequency signal, causing the board to read an out-of-range value. Check all connectors at both the switch and the board for secure seating and visible damage.

  4. 04

    Moisture or contamination in the pressure switch connector

    Wiring / connection

    Water intrusion into the wiring connector at the pressure switch can cause signal interference or short circuits that distort the frequency output. Look for corrosion or moisture inside the connector housing.

  5. 05

    Defective main control board

    Part replacement

    If the pressure switch, hose, and wiring all test as functional, the main control board may be misreading or failing to properly process the frequency signal from the sensor. This is the least common cause but should be considered after other components are eliminated.

See the test procedure for each cause

Frequently asked questions about E31

What does E31 mean on a Electrolux washer?
E31 indicates that the electronic pressure switch, which monitors water level inside the tub, is producing a frequency signal outside the acceptable range of 36.130 to 44.676 Hz for at least 5 continuous seconds. The washer stops operation to prevent overfilling or an incorrect wash cycle from running. The fault typically points to a failed pressure switch, a blocked air pressure hose, or a wiring issue between the sensor and the control board.
Can I fix the E31 error myself?
Some causes of E31 are DIY-accessible, such as clearing a clogged air pressure hose, reseating a loose wiring connector, or cleaning corrosion from the pressure switch terminals. If the pressure switch itself has failed, replacing it requires locating the correct part and basic appliance disassembly skills. Main control board replacement is more complex and may be better left to a qualified technician.
Is it safe to use my washer while the E31 code is active?
You should not continue running the washer with an active E31 code. The pressure switch is responsible for monitoring water level, and if it is malfunctioning, the washer cannot reliably detect an overfill condition. Running the machine in this state risks water overflow and potential water damage to your home or the appliance.
Will resetting the washer clear the E31 error?
A reset may temporarily clear the E31 code, but if the underlying fault in the pressure switch, hose, or wiring is still present, the error will return once the washer attempts to fill and the sensor signal goes out of range again. A reset alone does not fix the hardware problem causing the fault.
How much does it cost to repair an E31 error on an Electrolux washer?
Repair costs vary depending on the failed component. A replacement electronic pressure switch typically costs between $20 and $60 for the part, while professional labor adds $75 to $150 or more depending on your area. If the main control board is the cause, parts alone can range from $100 to $300, making that a significantly more expensive repair.

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