Bosch Dryer E01/E02 Error Code: Lint Filter or E02 Fault?

What Bosch Dryer E01 and E02 Mean

Bosch's dedicated E01/E02 dryer guidance starts with the lint filter. If the warning returns after the model-directed checks, diagnosis must use the exact E-Nr; the code alone does not identify an electronic part.

• E01/E02 lint-filter route: Bosch says E01 and E02 can be resolved by cleaning the lint filter: remove the lint, wash the filter under running water, dry it completely, and reinsert it.
• E02 model-specific guard: Bosch's broader dryer code table contains an E02 relay/control row, but that row's guide link leads to dishwasher support. It does not confirm a dryer relay fault for your E-Nr. Use the exact dryer manual and service information before assigning that interpretation.
• First safe decision: If the machine shows E01 or E02 with lint/filter behavior, clean and dry the lint filter correctly first. If E02 returns after that, stop guessing.
• Wrong shortcut to avoid: Do not run the dryer without the lint filter, puncture the filter, bypass thermal protection, reset internal parts, or open the control area to "prove" airflow.

E01/E02 Versus Nearby Bosch Dryer Codes

Keep this page on E01/E02. Bosch dryer codes that look adjacent can point to different systems.

• E01/E02: Bosch's exact page points first to the lint filter and filter airflow.
• Cleaning request indicator: Some Bosch manuals point to the lint filter and/or heat exchanger, so a model-allowed condenser or heat-exchanger check may matter when drying time is long.
• E12: Bosch identifies this as overheating or restricted airflow. It is close to the airflow family, but it is not the same displayed code as E01/E02.
• E03 or DR: Bosch's broad support lists E03 as a condensation-drain hose warning. For DR, confirm the E-Nr: the WTG86401UC manual uses incomplete drainage, while the broad support list has a door-related example. Use the DR page when that exact warning is the main problem.
• E06, E08, E09, E24, E25, E28, E36, or E90: Bosch groups these with electronic faults that need technician diagnosis.
• E63: Bosch lists this as a heating element failure. If the actual complaint is heat or drying, use a heat or drying-performance page instead of treating E01/E02 as a heating-element page.

Safe Checks

• Bosch model identity: E-Nr, FD, and model label. E02 is the code that most needs model/source confirmation.
• Clean the lint filter fully: Remove lint from the filter. If residue or a lint mat remains, rinse the filter under running water and dry it completely before reinstalling it.
• Check filter seating: Make sure the filter is not wet, warped, torn, missing, or sitting crooked. Do not run the dryer to test airflow without the filter installed.
• Clean only visible lint-filter areas: Remove loose lint from the owner-accessible filter opening. Use only soft/manual-safe methods and do not push hard tools deep into the dryer.
• Use model-allowed condenser care: On Bosch condenser or ventless models with an owner-accessible condenser or heat exchanger, follow the manual cleaning steps. Do not remove panels to reach parts that are not owner-accessible.
• Check accessible airflow: If the dryer has a visible air inlet or safe exterior vent access, look for obvious blockage, crushed ducting, or poor room airflow. Do not pull out a stacked or built-in dryer unless access is stable and safe.
• Restart once after a real correction: If the filter was clogged, wet, or mis-seated and you corrected it, restart once according to the controls. Repeated resets after the same code returns do not diagnose the fault.

If E01 or E02 Returns After Cleaning

A clean-looking filter does not prove the whole airflow or code-recognition route is clear.

• Wet or residue-loaded filter: A rinsed filter that is reinstalled wet, or a screen coated with dryer-sheet residue, can still behave like a restriction.
• Damaged or mis-seated filter: A torn, warped, missing, or crooked filter can change airflow and lint handling. Stop using the dryer until the filter issue is corrected.
• Lint below the opening: Loose lint in the filter cavity or around the filter housing can keep the airflow route restricted even after the screen is wiped.
• Condenser or heat-exchanger restriction: On models that use those parts and allow owner cleaning, a dirty condenser or heat exchanger can pair with lint-filter warnings, long drying time, or damp loads.
• Air inlet or vent restriction: Blocked room air, a crushed duct, or an obstructed outlet can make the dryer run hot or dry slowly even after the filter is clean.
• Persistent E02: If the exact warning returns after the model-directed filter and airflow checks, use the exact E-Nr manual. Persistence alone does not make the catalogue's mixed relay/control row more applicable or identify a failed board.

When Another Bosch Dryer Page Is the Better Fit

Use the exact symptom when the displayed code is not the whole problem.

• Clothes stay damp without E01/E02: Use Bosch dryer not drying clothes.
• Dryer gets hot but clothes stay wet: Use Bosch dryer hot but clothes wet.
• Dryer runs and stops mid-cycle: Use Bosch dryer keeps stopping mid-cycle.
• Dryer has no heat as the main symptom: Use Bosch dryer not heating.
• Display says DR or Check drain: Use Bosch dryer DR problem.
• Water is the visible issue: Use Bosch dryer leaking water.

When to Stop Using the Dryer

Stop homeowner checks if E01 or E02 returns after the lint filter is clean, dry, and seated and any model-allowed condenser or visible airflow check is done. Stop immediately if there is a burning or electrical smell, smoke, scorch marks, water near electrical areas, a damaged cord, repeated breaker trip, a missing or damaged lint filter, or unstable access to a stacked or built-in dryer.

Do not run the dryer without the lint filter, puncture the filter, bypass a switch or thermal device, reset internal thermostats, test live voltage, open the control area, or keep restarting the dryer to finish a load. Those actions can turn a filter or airflow warning into a fire, electrical, or component-damage risk.

What Diagnosis Must Confirm

Service diagnosis should start with the E-Nr, exact display, and which Bosch source applies to that model. For the lint-filter route, diagnosis should confirm filter airflow, filter seating, filter housing condition, condenser or heat-exchanger condition where applicable, air inlet or vent restriction, temperature behavior, and whether the dryer recognizes corrected airflow.

For a persistent E02, diagnosis must confirm the exact E-Nr service-data route before naming a board or relay. Depending on that confirmed route, professional checks can include relay/control output, wiring, sensor input, fault history, and whether a filter or airflow issue is being misread as an electronic fault.

FAQ

Are Bosch dryer E01 and E02 the same?

Bosch's dedicated E01/E02 dryer guidance gives both codes a lint-filter care route. If E02 returns, check the exact E-Nr manual and arrange diagnosis; a mixed relay/control entry in the broader catalogue does not establish the meaning for your dryer.

Why does E01 or E02 come back after I cleaned the filter?

The filter may still be wet, residue-coated, damaged, missing, or mis-seated. The restriction can also be in the owner-accessible filter opening, condenser or heat exchanger on some models, blocked room air, or a downstream vent/airflow route. If the code returns after safe visible checks, diagnosis has to prove airflow and sensing instead of guessing a part.

Can I run a Bosch dryer without the lint filter to test E01/E02?

No. Do not run the dryer without the lint filter, and do not puncture or modify the filter. The filter is part of lint control and airflow management; bypassing it can move lint into unsafe areas and can damage the dryer.

Is Bosch dryer E01/E02 the same as E12?

No. E12 is the Bosch restricted-airflow or overheating neighbor, so it can point to a related airflow family, but it is a different displayed code.

Does E02 mean I need a control board?

Not from the code alone. Bosch's dedicated E01/E02 dryer guidance starts with the lint filter. A persistent E02 needs model-specific diagnosis; the broader relay/control row links to dishwasher support and cannot establish a dryer control-board replacement.