Bosch Washer Error Codes: Complete Troubleshooting Guide

Bosch washing machines are engineered in Germany and built to last, but even premium appliances encounter problems. When your Bosch washer detects a fault, it displays an error code on the control panel — an alphanumeric code starting with "E" followed by numbers. Understanding what these codes mean is the first step toward getting your laundry back on track. This guide covers every Bosch washer error code across the 300 Series (WAT28400UC), 500 Series (WGA25400UC, WFR2860UC), 800 Series (WAW285H2UC, WAV28G43), and Compact models (WGA12400UC) — including Home Connect-enabled units.

How Bosch Washer Error Codes Work

Bosch washers use a sophisticated network of sensors monitored by the main control board. When a sensor reading falls outside the expected range, the board halts the cycle and displays an E-code. On models with the Home Connect app, error codes are also sent as push notifications to your phone with basic diagnostic information.

Before troubleshooting any error code, try a basic reset:

1. Press the Power button to turn the washer off.
2. Unplug from the wall outlet for 60 seconds.
3. Plug back in and run a short Rinse & Spin cycle.

If the error returns, proceed with the specific troubleshooting steps below. Always write down or photograph the exact error code — some codes clear after a power cycle and are difficult to retrieve without the Home Connect app.

E02 — Motor Issue

E02 indicates the main drive motor is not functioning correctly. This is a serious error that usually requires professional service.

Common causes:

• Motor winding failure in the EcoSilence Drive (BLDC) motor
• Carbon brush wear (older models with universal motors only — EcoSilence Drive models are brushless)
• Motor control module fault on the main board
• Loose wiring connection between the motor and control board

How to fix:

1. Unplug the washer and try spinning the drum by hand. It should rotate freely without grinding or resistance.
2. On older Bosch models with carbon brushes, check if the brushes are worn below 1/4 inch — replacement set (part 00-154740) costs $15–$25.
3. For EcoSilence Drive models (most 2018+ units), the motor is brushless — skip brush inspection entirely. The issue is likely the motor control module on the main board.
4. Measure motor winding resistance between terminals — expect 2–8 ohms. An open or shorted reading confirms motor failure.
5. Motor replacement (part 00-145699) runs $250–$500 installed. Motor control module (part 00-706018) is $180–$350.

Pro tip: Check the model badge on the front of your washer. If it says "EcoSilence Drive," the motor is brushless and virtually never fails mechanically. E02 on these models almost always points to the motor control module or wiring.

E04 — Water Leak Detected (AquaStop)

E04 is triggered by Bosch's AquaStop leak protection system. A float switch in the base pan detects water where it should not be.

Common causes:

• Door boot seal (gasket) tear or foreign object damage
• Loose hose clamp at the tub, pump, or inlet valve connection
• Tub-to-bearing seal failure (indicated by rusty water residue on clothes)
• AquaStop supply hose triggered by even minor seepage

How to fix:

1. Unplug the washer and tilt it slightly backward to check for water in the base pan. Soak up any water with towels.
2. Inspect the door boot seal thoroughly — run your fingers along the inner folds looking for tears, small holes, or lodged objects like coins or wire.
3. Place a dry paper towel sheet under each hose connection point and run a 15-minute cycle to isolate the exact leak source.
4. If the tub bearing seal is leaking (rusty water on clothes is the telltale sign), this is a major repair — the tub bearing seal kit (part 00-248534) requires near-complete disassembly.

Important: The AquaStop supply hose (part 00-667327) has an electrical shutoff valve. Once triggered, it locks permanently and cannot be manually reset — the entire hose must be replaced ($60–$90).

E13 — Water Supply Error

The washer is not receiving water or the flow rate is too low to fill within the expected time.

Common causes:

• Water supply valves behind the washer not fully open
• Kinked inlet hoses
• Clogged inlet screen filters (mesh filters inside the hose connections)
• Low household water pressure (Bosch requires minimum 15 PSI)

How to fix:

1. Check that both hot and cold supply valves behind the washer are fully open.
2. Turn off the water supply, disconnect the inlet hoses, and inspect the small mesh filter screens inside the hose connections. Clean any sediment with a toothbrush and white vinegar.
3. Check water pressure — Bosch washers need 15–120 PSI. If pressure is borderline, E13 may appear only on quick-wash programs (VarioSpeed models fill faster and are more sensitive to low pressure).
4. If screens are clean and pressure is adequate, the inlet valve (part 00-622058) may need replacement ($45–$80).

E17 — Fill Timeout

Similar to E13 but E17 specifically indicates the washer started filling yet could not reach the correct water level within the allowed time.

Common causes:

• Low water pressure (below 15 PSI)
• Inlet valve solenoid failure (coil burns out, preventing full flow)
• Pressure sensor hose disconnected, kinked, or has a pinhole leak
• Air dome blockage on the outer tub

How to fix:

1. Test the inlet valve solenoid coil resistance — expect 800–1500 ohms. An open reading means the coil is burned out.
2. Inspect the pressure sensor hose — a small clear tube running from the outer tub to the control board. This is the most overlooked cause. If the hose slips off the air dome or develops a pinhole, the board never reads the correct water level.
3. Blow gently into the pressure sensor hose. You should feel slight back-pressure from the air dome on the tub.
4. Inlet valve replacement (part 00-622058) costs $45–$80. Pressure sensor (part 00-637136) costs $35–$60.

E18 — Drain Timeout

The most common Bosch washer error code. E18 means the washer cannot drain water within the allowed time — typically because the pump filter is clogged.

Common causes:

• Clogged drain pump filter (coins, buttons, hair clips, lint — the #1 cause)
• Kinked drain hose
• Drain hose inserted too far into standpipe
• Drain pump impeller broken or jammed
• Blockage in house drain

How to fix:

1. Locate the pump filter access panel at the front bottom of the washer.
2. Place towels and a shallow pan underneath — there will be residual water.
3. Slowly unscrew the pump filter cap counterclockwise. Water will drain out — let it flow into the pan.
4. Remove all debris from the filter cavity. Check the impeller behind the filter for damage or foreign objects.
5. Clean the filter cap seal and reinstall. The filter should be cleaned every 3–4 months as preventive maintenance.
6. Check the drain hose for kinks and verify proper installation height (maximum 39 inches from floor to drain connection).

Pro tip: If E18 recurs after cleaning the filter, listen to the drain pump during operation. A rattling sound indicates a broken impeller blade — the pump assembly (part 00-436440) needs replacement ($75–$140) even though the filter area appears clear.

E27 — Door Lock Error

The washer cannot confirm the door is properly locked. The cycle will not start or stops mid-cycle.

Common causes:

• Door not fully closed or clothing caught in the rubber gasket
• Door strike plate bent or misaligned
• Door lock assembly failure (bimetal element or detect microswitch)
• Wiring harness damage at the door hinge (flex fatigue)

How to fix:

1. Open the door fully and check that nothing is caught in the rubber boot gasket. Close firmly until you hear a distinct click.
2. Inspect the door strike plate for alignment — a bent strike prevents proper engagement with the lock mechanism.
3. Bosch door locks use a bimetal element that takes 2–3 seconds to heat and engage. If you hear the lock click but E27 still appears, the detect microswitch inside the lock assembly is failing — the lock engages mechanically but the board receives no confirmation.
4. Door lock assembly replacement (part 00-633765) costs $60–$100.

E43 — Door Lock Motor Error

E43 specifically indicates the motorized lock actuator has failed, distinct from the E27 detection circuit issue.

Common causes:

• Lock motor failure
• Control board relay issue (the relay powering the lock motor)
• Wiring damage between the board and lock assembly

How to fix:

1. Power cycle the washer — wait 5 minutes before retrying.
2. Check the lock motor for 120VAC at the connector during a lock attempt. If voltage is present but the motor does not engage, replace the door lock assembly (part 00-633765, $60–$100).
3. If no voltage reaches the connector, the control board relay may have failed — board replacement (part 00-706018) runs $180–$350.

Emergency access: If the door is locked with laundry inside, find the emergency release pull tab behind the pump filter panel at the bottom front. Pull the tab to manually release the door.

E28 — Sensor Error

A general sensor communication error indicating the control board cannot read one or more sensors correctly.

Common causes:

• Faulty NTC temperature sensor
• Pressure sensor failure
• Corroded wiring connector
• Control board sensor input circuit failure

How to fix:

1. Check the Home Connect app if available — it may identify the specific sensor that failed.
2. Measure the NTC temperature sensor resistance at the tub — expect approximately 10,000 ohms (10kOhm) at room temperature (68F).
3. Inspect all sensor wire connectors for corrosion, especially in humid laundry rooms.
4. NTC sensor (part 00-611341) costs $20–$35. Pressure sensor (part 00-637136) costs $35–$60.

E29 — Drain Pump Blocked

More specific than E18 — E29 indicates the drain pump motor is running but water is not moving.

Common causes:

• Foreign object jammed in the pump impeller
• Broken pump impeller blade
• Drain hose completely blocked
• Pump motor shaft disconnected from impeller

How to fix:

1. Follow the E18 pump filter cleaning procedure first.
2. After removing the filter, reach into the pump cavity and try to spin the impeller manually. It should rotate freely.
3. If the impeller spins but feels loose or wobbly, the shaft connection is broken — the entire pump assembly needs replacement.
4. Pump assembly (part 00-436440) costs $75–$140.

E32 — Load Imbalance

The washer detected an unbalanced load during the spin cycle and stopped to protect the drum bearings.

Common causes:

• Single heavy item bunched on one side of the drum
• Washing a single large item alone
• Washer not level on the floor
• Worn shock absorbers (common after 7–10 years)

How to fix:

1. Open the door and redistribute clothing evenly around the drum. Add towels if washing a single heavy item.
2. Check that all four leveling feet are firmly on the floor. Adjust feet and tighten lock nuts.
3. If E32 appears frequently with normal loads, the shock absorbers are likely worn. Bosch front-loaders use two shock absorbers (part 00-673541, $25–$40 each).

Home Connect Smart Diagnostics

Bosch Home Connect (500 and 800 Series, 2019+) enhances error troubleshooting:

1. Remote error alerts: Push notifications when an error occurs, even away from home.
2. Error history log: Stores the last 20 error events with timestamps for intermittent issue tracking.
3. Step-by-step guides: Model-specific repair guidance for each error code.
4. Remote service request: Submit a service request with error data pre-filled.

To set up: download the Home Connect app, create an account, power on the washer, hold the Remote Start button for 3 seconds to enter pairing mode, then follow the Wi-Fi setup instructions.

Frequently Asked Questions

Q: How do I reset my Bosch washer error code? A: Power off, unplug for 60 seconds, plug back in, and run a Rinse & Spin cycle. For persistent errors, hold Start/Pause for 5 seconds before powering off. Most E-codes clear after the root cause is fixed and a successful cycle completes.

Q: Why does my Bosch washer show E18 even after I cleaned the pump filter? A: The drain pump impeller may be broken (rattling sound during drain confirms this), the drain hose may be blocked at a hidden point, or the pump motor itself is failing. Flush the drain hose, listen to the pump, and replace the pump assembly (part 00-436440) if needed.

Q: What is AquaStop and why did it trigger? A: AquaStop is Bosch's flood protection. It includes a double-walled supply hose with an electrical shutoff valve and a float switch in the base pan. If any water reaches the base pan, AquaStop shuts off supply and triggers E04. The hose valve locks permanently once triggered and must be replaced.

Q: Are compact 24-inch Bosch washers different from full-size? A: Error codes are identical, but compact models are common in Bay Area apartments and often run on 208V instead of standard 120V. Voltage issues in older buildings can cause E02 or E28 errors. Verify the outlet voltage matches the rating plate specification.

Q: How long is the Bosch washer warranty? A: Bosch provides a 1-year full parts and labor warranty. The EcoSilence Drive motor carries a 10-year limited warranty (motor only, labor not included). Keep your purchase receipt for warranty service.

When to Call a Professional

While E18 filter cleaning and E13 water supply checks are safe DIY tasks, some Bosch washer errors require professional service:

• E02 motor errors — Motor and control module diagnosis requires specialized tools.
• E04 with bearing seal failure — Near-complete disassembly; parts and labor run $400–$600.
• E43 with board failure — Control board replacement requires proper part matching.
• Repeated errors after DIY fix — An intermittent fault may have a secondary cause.
• Any burning smell or sparking — Disconnect power immediately.

Dealing with a stubborn Bosch washer error code? EasyBear technicians are trained on all Bosch 300, 500, and 800 Series washers — including the compact European-style units common in Bay Area apartments. We offer free diagnostic visits with the most common Bosch parts in stock for same-day repair. Every job is backed by our 90-day parts and labor warranty. Book your free diagnosis today.