E31 Error on Electrolux Washer? Comprehensive Fix Guide

The Electrolux Washer Error E31 is a specific diagnostic code indicating that the electronic pressure sensor (pressure switch) is sending a signal to the main control board that is “out of range.” Essentially, the frequency signal generated by the sensor—used to measure water levels—is either too high or too low for the control board to interpret safely.

If you are seeing this code, you might notice your washer refusing to fill, stopping mid-cycle, or running the drain pump continuously while the display flashes. You might also notice the water isn’t heating or the door remains locked. While a “sensor signal” error sounds like a complex computer failure, it is often a mechanical or connection issue that you can resolve with a systematic approach. Don’t worry; this is a fixable problem that doesn’t necessarily mean your washer is headed for the landfill.

Comprehensive Repair Guide

Follow these steps meticulously to diagnose and repair the E31 error. Proceed in order from the easiest (and cheapest) fix to the most complex.

1. Power Reset (The “Soft” Fix):

   Unplug the washer for a full 10 minutes. This allows the capacitors on the main control board to discharge fully, which can sometimes clear a “logic glitch.” While the machine is unplugged, check the drain filter at the bottom front of the unit. A clogged filter can sometimes cause back-pressure issues that interfere with the sensor readings.

2. Accessing the Pressure Switch:

   Using your Phillips or T20 Torx screwdriver, remove the screws located at the back of the top panel. Slide the top panel toward the rear of the machine and lift it off. The pressure switch is typically a small, circular plastic component located on the right-hand side (when facing the front), mounted to the side frame. It will have a thin rubber hose attached to the bottom and a wire harness at the top.

3. Inspecting the Pressure Hose:

   Carefully pull the thin rubber hose off the nipple of the pressure switch (you may need pliers to slide the spring clamp down). Critical Step: Blow into the hose firmly. You should hear a bubbling sound coming from the bottom of the tub. If you feel resistance or the hose feels “clogged,” there is debris in the air trap. Use a turkey baster or a syringe to flush warm water and white vinegar down the hose to clear out any gunk. Check the entire length of the hose for pinholes or cracks; even a tiny air leak will cause an E31 error.

4. Testing Wiring Continuity:

   Disconnect the wiring harness from the pressure switch. Set your multimeter to the “Continuity” or “Ohms” setting. Check the wires for any visible signs of corrosion or burning. If possible, trace the wires back to the main control board and test for continuity to ensure no wires are broken inside the insulation. Ensure the pins are seated firmly; sometimes simply unplugging and replugging the connector cleans the contact points enough to restore the signal.

5. Replacing the Electronic Pressure Switch:

   If the hose is clear and the wiring is intact, the sensor itself has likely failed. To replace it, unclip it from its mounting bracket, disconnect the hose and wires, and install the new OEM part. Note: Do not blow into the new electronic sensor with your mouth, as the moisture and pressure from your lungs can damage the sensitive internal diaphragm.

6. Reassembly and Calibration:

   Reattach the hose and wiring harness. Replace the top cover. Plug the unit back in and run a “Rinse & Spin” cycle. This allows the machine to calibrate the “Empty” versus “Full” pressure readings without a long wash cycle.

Why is my Electrolux showing Error E31?

To fix the E31 error, we must understand the “out of range” signal. The electronic pressure switch works by translating the air pressure inside a small tube into a frequency (Hz). If that frequency deviates from the manufacturer’s logic map, the error triggers.

1. Clogged Pressure Tube or Air Trap: This is the most common “nuanced” cause. Over time, sediment, undissolved detergent, or fabric softener can build up in the “air trap” (the chamber at the bottom of the tub). This creates a blockage or a “slug” of water in the tube, causing the air pressure to spike or drop erratically, sending a signal that the control board deems impossible.

2. Component Failure (Pressure Switch): The sensor itself contains a delicate diaphragm and an electronic circuit. Wear and tear from thousands of cycles can cause the diaphragm to rupture or the internal oscillator to fail. If the sensor cannot produce a steady frequency, the E31 code is the result.

3. Wiring Harness Integrity: Washers vibrate significantly during the spin cycle. This vibration can lead to “micro-fretting” at the wiring connectors. If the wires connecting the pressure switch to the main control board have high resistance, or if a wire has been pinched or frayed, the signal integrity is lost before it reaches the “brain” of the machine.

4. Voltage Spikes: Occasionally, a power surge can corrupt the momentary logic of the main control board. While less common, the E31 can sometimes be a “ghost” error caused by a control board that has lost its calibration for the sensor’s voltage range.

Symptoms of Error E31

When an Electrolux washer encounters the E31 error state, it prioritizes safety to prevent a flood. You will likely notice one or more of the following physical signs:

• Persistent Draining: The machine may kick into a “drain-only” mode where the pump runs indefinitely, even if there is no water in the drum. This is a failsafe to prevent overfilling.
• Cycle Stalling: The washer may fill for a few seconds and then abruptly stop, displaying the E31 code and refusing to advance to the wash or spin phase.
• Inaccurate Water Levels: In some cases, the unit might overfill with water because the sensor isn’t reporting the level correctly, or conversely, it may fail to draw any water at all.
• Audible Clicks: You might hear the electronic pressure switch clicking repeatedly as it tries to calibrate the air pressure against its internal diaphragm.
• Display Flash: The LED display will alternate between the cycle time and the E31 code, often accompanied by a repetitive beeping sound.

How to Prevent Error E31

Once you have resolved the error, taking these preventative steps will ensure the E31 code doesn’t return in a few months:

• Use High-Efficiency (HE) Detergent Only: Standard detergents create too many suds. Excess foam can enter the pressure hose and dry into a solid blockage, eventually leading to a sensor failure. Always follow the manufacturer’s recommended amount—usually much less than you think.
• Monthly Maintenance Wash: Run a “Clean Washer” cycle or a hot water wash with a dedicated tub cleaner once a month. This dissolves the “scrud” (soap scum and debris) that accumulates in the air trap chamber, keeping the pressure signal clear.
• Level the Machine: Use a spirit level to ensure the washer is perfectly flat. Excessive vibration can loosen the electrical connectors on the pressure switch, leading to the intermittent signals that trigger E31.
• Surge Protection: Consider plugging your washer into a high-quality surge protector designed for appliances. The sensitive electronics in the pressure switch and control board are prone to damage from voltage fluctuations.

Frequently Asked Questions

Q: Can I manually reset the E31 code without opening the machine?
A: Generally, no. While a power reset might clear the code temporarily, E31 is a hardware-range error. If the sensor is detecting a frequency that shouldn’t exist, the code will reappear as soon as the machine attempts to sense the water level during the next cycle. You must address the physical cause (hose or sensor).

Q: How do I know if it’s the hose or the actual sensor?
A: The “blow test” is the best diagnostic. If you blow into the hose and feel significant resistance, the problem is a clog (the hose/air trap). If the hose is completely clear and the wiring looks perfect, the sensor’s internal electronics are almost certainly the culprit.

Q: Is Error E31 the same as E32?
A: They are related but distinct. E31 means the signal is “out of range” (garbage data), whereas E32 usually means the sensor is not calibrated or there is a discrepancy during the drain phase specifically. Both usually involve the pressure system, but E31 is more likely to be a total component or wiring failure.