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

What Bosch Dryer E01 and E02 Mean

Bosch's exact E01/E02 dryer guidance points to the lint filter first. Treat that as the first answer, then use the model label and exact display to decide whether E02 needs a separate electronic-fault diagnosis.

• 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 also lists E02 as a main control board relay fault/error. That does not make every E02 a board failure, but it means a persistent E02 should be checked against the E-Nr and model manual.
• 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 and document the model, exact code, and what was cleaned.
• 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: These belong to drainage/check-drain routes on Bosch dryer guidance and manuals. If DR is the main warning, use the DR page instead of treating it as E01/E02.
• 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 Before Service

• Record the Bosch model: Photograph the E-Nr, FD, and model label. E02 is the code that most needs model/source confirmation.
• Photograph the display: Capture E01, E02, E12, DR, E03, E06, E63, a filter symbol, or any other message before resetting the dryer.
• 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.
• Model-specific E02 fault: If the exact E02 returns after correct filter and airflow checks, the broad Bosch E02 relay/control row becomes more relevant. That is a service diagnosis, not a board-replacement instruction.

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 model-specific E02, diagnosis should confirm the service-data route before naming a board or relay. That can include relay/control output, wiring, sensor input, fault history, and whether an airflow or filter issue is being misread as an electronic fault.

What to Record Before Service

• Model label: Bosch E-Nr, FD, and full model photo.
• Exact warning: E01, E02, E12, DR, E03, E06, E63, filter symbol, or another displayed message.
• Timing: Code at start, mid-cycle, near the end, after cleaning, or after moving/stacking the dryer.
• Filter condition: Lint mat, residue, wet filter, damaged filter, missing filter, or filter not seating flat.
• Drying symptom: Normal heat, no heat, too hot, clothes still damp, long dry time, or cycle stopping.
• Airflow view: Visible air inlet, exterior vent if accessible, crushed duct, closet airflow, condenser or heat-exchanger condition if the model allows access.
• Recent changes: Filter rinse, condenser cleaning, vent work, duct movement, stacking, reinstall, or repeated resets before the code returned.

FAQ

Are Bosch dryer E01 and E02 the same?

They often share the lint-filter route on Bosch's exact E01/E02 guidance, but E02 needs an extra model check because Bosch also lists a separate E02 relay/control fault row in the broader dryer code table. Treat lint-filter cleaning as the first safe action, then use the E-Nr and manual if E02 returns.

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. Photograph the exact code before choosing the repair route.

Does E02 mean I need a control board?

Not from the code alone. Bosch has an official E01/E02 lint-filter route and also a broader E02 relay/control row. If E02 persists after correct filter and airflow checks, the model-specific control diagnosis needs technician diagnosis; it is not a homeowner board-replacement instruction.