Electrolux E31
Pressure Switch
Medium severityExpert Guide
SeverityMedium
What Your Machine Is Actually Telling You
The pressure switch (also called the level sensor or pressure transducer) is how your washer knows how much water is in the drum. It works via a simple but clever mechanism: a thin air hose runs from the outer tub up to the switch mounted high on the frame. As water rises in the tub, it compresses the air in this hose. The switch converts that air pressure into an electrical signal the board can read.
E31 means the board detected an electrical fault in this circuit. The signal from the pressure switch is either missing, stuck at a fixed value, or jumping wildly — the board can't trust the reading, so it stops the cycle.
Why this matters for safety: Without a reliable water level reading, the board has no way to know when to stop filling. If it kept filling without a working pressure switch, the machine could overflow — which is why it throws E31 and stops immediately.
Common causes in order of likelihood:
1. Loose or corroded wiring connector at the pressure switch (40% of cases) — vibration gradually works the connector loose.
2. Blocked or kinked air hose (25%) — the thin tube from the tub to the switch gets pinched during maintenance or blocked with detergent residue.
3. Failed pressure switch (25%) — the internal membrane or electronic component has failed.
4. Control board input fault (10%) — the board's ADC (analog-to-digital converter) for the pressure input has failed.
E31 means the board detected an electrical fault in this circuit. The signal from the pressure switch is either missing, stuck at a fixed value, or jumping wildly — the board can't trust the reading, so it stops the cycle.
Why this matters for safety: Without a reliable water level reading, the board has no way to know when to stop filling. If it kept filling without a working pressure switch, the machine could overflow — which is why it throws E31 and stops immediately.
Common causes in order of likelihood:
1. Loose or corroded wiring connector at the pressure switch (40% of cases) — vibration gradually works the connector loose.
2. Blocked or kinked air hose (25%) — the thin tube from the tub to the switch gets pinched during maintenance or blocked with detergent residue.
3. Failed pressure switch (25%) — the internal membrane or electronic component has failed.
4. Control board input fault (10%) — the board's ADC (analog-to-digital converter) for the pressure input has failed.
What You're Probably Seeing Right Now
- The machine won't fill at all — it starts the cycle, attempts to activate the inlet valve, but immediately stops with E31 because it can't verify the water level.
- The machine fills continuously and then overflows slightly before throwing E31 — the switch is stuck reading "empty" so the board keeps filling.
- Water level seems random — sometimes the drum is half full, sometimes nearly empty, sometimes overfull. The switch is giving inconsistent readings.
- E31 appeared after the machine was moved or after maintenance — the air hose may have been disconnected or kinked during the process.
- The machine works fine for a few cycles, then randomly shows E31 — this is classic for a loose connector that vibration intermittently disconnects.
DIY Fix — From Easiest to Hardest
1
Power Reset First (2 minutes)
Sometimes E31 is triggered by a brief electrical glitch:
1. Unplug the machine from the wall for **10 full minutes.**
2. Plug back in and select a short cycle.
3. If E31 doesn't return, it was a one-time glitch — likely a power fluctuation or static discharge.
**If E31 returns immediately:** The problem is persistent and needs physical investigation.
1. Unplug the machine from the wall for **10 full minutes.**
2. Plug back in and select a short cycle.
3. If E31 doesn't return, it was a one-time glitch — likely a power fluctuation or static discharge.
**If E31 returns immediately:** The problem is persistent and needs physical investigation.
2
Locate and Reseat the Pressure Switch Connector (10 minutes)
This fixes **~40% of E31 cases**:
1. **Unplug the machine.**
2. **Remove the top panel** — on most Electrolux front-loaders, this involves removing 2-3 Phillips screws at the back edge of the top panel, then sliding the panel backward and lifting it off.
3. The pressure switch is typically located on the **right side wall** near the top — it's a small round plastic component about the size of a golf ball with an electrical connector and a thin rubber or silicone tube attached.
4. **Unplug the electrical connector** from the switch, wait 30 seconds, then **firmly push it back on** until you feel/hear a click.
5. Check for **corrosion on the connector pins** — green or white crusty buildup. Clean with electrical contact cleaner or isopropyl alcohol if present.
**While you're here:** Check that the wiring harness isn't pinched or chafing against any metal edges.
1. **Unplug the machine.**
2. **Remove the top panel** — on most Electrolux front-loaders, this involves removing 2-3 Phillips screws at the back edge of the top panel, then sliding the panel backward and lifting it off.
3. The pressure switch is typically located on the **right side wall** near the top — it's a small round plastic component about the size of a golf ball with an electrical connector and a thin rubber or silicone tube attached.
4. **Unplug the electrical connector** from the switch, wait 30 seconds, then **firmly push it back on** until you feel/hear a click.
5. Check for **corrosion on the connector pins** — green or white crusty buildup. Clean with electrical contact cleaner or isopropyl alcohol if present.
**While you're here:** Check that the wiring harness isn't pinched or chafing against any metal edges.
3
Inspect and Clear the Pressure Air Hose (5 minutes)
The thin air hose connecting the tub to the pressure switch is critical:
1. Trace the **small rubber/silicone tube** from the pressure switch down to where it connects to the tub (usually at the side or bottom of the outer tub).
2. **Check for kinks** — especially at bends. Even a slight kink restricts air flow and gives false readings.
3. **Check for disconnections** — the tube should be firmly attached at both ends. Pull gently to verify it's seated.
4. **Blow through the tube** from the switch end — you should feel air flow freely and hear a faint gurgle from the tub. If you can't blow through it, the tube is blocked.
5. If blocked, **disconnect the tube** and flush with warm water to clear detergent residue buildup.
**Important:** When reconnecting, ensure the tube isn't twisted or creating a U-bend that could trap water — this is equivalent to a partial blockage.
1. Trace the **small rubber/silicone tube** from the pressure switch down to where it connects to the tub (usually at the side or bottom of the outer tub).
2. **Check for kinks** — especially at bends. Even a slight kink restricts air flow and gives false readings.
3. **Check for disconnections** — the tube should be firmly attached at both ends. Pull gently to verify it's seated.
4. **Blow through the tube** from the switch end — you should feel air flow freely and hear a faint gurgle from the tub. If you can't blow through it, the tube is blocked.
5. If blocked, **disconnect the tube** and flush with warm water to clear detergent residue buildup.
**Important:** When reconnecting, ensure the tube isn't twisted or creating a U-bend that could trap water — this is equivalent to a partial blockage.
4
Clean the Air Trap / Pressure Chamber (10 minutes)
At the tub end of the air hose, there's a **dome-shaped air chamber** (also called the air trap or pressure dome):
1. If accessible, disconnect the air hose at the tub connection point.
2. The pressure chamber may be **removable** (a plastic dome clipped or screwed to the tub) or **integrated into the tub** (non-removable).
3. If removable, **soak it in hot water with white vinegar** for 20 minutes to dissolve mineral and detergent buildup.
4. Rinse thoroughly and ensure the small port where the hose connects is completely clear.
5. Reinstall and reconnect the hose.
**Why this matters:** Over time, a thick paste of detergent residue and lint accumulates in the pressure chamber, gradually restricting the air channel. This causes the pressure reading to lag behind actual water level, eventually triggering E31.
1. If accessible, disconnect the air hose at the tub connection point.
2. The pressure chamber may be **removable** (a plastic dome clipped or screwed to the tub) or **integrated into the tub** (non-removable).
3. If removable, **soak it in hot water with white vinegar** for 20 minutes to dissolve mineral and detergent buildup.
4. Rinse thoroughly and ensure the small port where the hose connects is completely clear.
5. Reinstall and reconnect the hose.
**Why this matters:** Over time, a thick paste of detergent residue and lint accumulates in the pressure chamber, gradually restricting the air channel. This causes the pressure reading to lag behind actual water level, eventually triggering E31.
5
Test the Pressure Switch with a Multimeter (5 minutes)
If you have a multimeter:
1. **Unplug the machine.**
2. Disconnect the electrical connector from the pressure switch.
3. Measure **resistance between the switch terminals.** Expected values vary by model, but in general:
- With no pressure (tube disconnected): one set of contacts should show **continuity (~0Ω)** and another should show **open (OL)**.
- When you blow gently into the tube port: the contacts should **swap** — the closed one opens and the open one closes. You'll hear a faint click.
4. If blowing into the port produces **no click and no resistance change**, the internal membrane has failed. Switch needs replacement.
**Analog vs. digital switches:** Newer Electrolux models may use an electronic pressure sensor (produces a variable voltage) instead of a mechanical switch. These require checking the output voltage with a multimeter — consult your model's service manual for expected values.
1. **Unplug the machine.**
2. Disconnect the electrical connector from the pressure switch.
3. Measure **resistance between the switch terminals.** Expected values vary by model, but in general:
- With no pressure (tube disconnected): one set of contacts should show **continuity (~0Ω)** and another should show **open (OL)**.
- When you blow gently into the tube port: the contacts should **swap** — the closed one opens and the open one closes. You'll hear a faint click.
4. If blowing into the port produces **no click and no resistance change**, the internal membrane has failed. Switch needs replacement.
**Analog vs. digital switches:** Newer Electrolux models may use an electronic pressure sensor (produces a variable voltage) instead of a mechanical switch. These require checking the output voltage with a multimeter — consult your model's service manual for expected values.
6
Replace the Pressure Switch (15 minutes)
If the switch has failed:
1. **Order the correct replacement** — use your model number (found on the sticker inside the door frame). Electrolux pressure switches are model-specific.
2. Remove the old switch — typically held by a single screw or plastic clip.
3. Transfer the air hose and electrical connector to the new switch.
4. Mount the new switch in the same position.
5. Run a test cycle.
**Pro tip:** When ordering, take a photo of the old switch and its connections. Some models have multiple wire configurations.
1. **Order the correct replacement** — use your model number (found on the sticker inside the door frame). Electrolux pressure switches are model-specific.
2. Remove the old switch — typically held by a single screw or plastic clip.
3. Transfer the air hose and electrical connector to the new switch.
4. Mount the new switch in the same position.
5. Run a test cycle.
**Pro tip:** When ordering, take a photo of the old switch and its connections. Some models have multiple wire configurations.
When to Call a Pro
- •Switch tests fine, connections tight, tube clear — the problem is likely on the control board side. The board's ADC circuit has failed. Board replacement needed: $200-$500 with labor.
- •E31 intermittent and only during spin — vibration during high-speed spin can expose a wire break that isn't visible. A technician with a scope can find intermittent wiring faults.
- •Machine is overfilling despite E31 — this is a dangerous condition. The safety cutoff isn't working properly. Stop using until professionally inspected.
- •You're not comfortable removing the top panel — that's perfectly reasonable. The diagnosis from this point requires accessing internal components. Service call: $80-$150.
What It'll Cost You
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