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Error code reference

Bosch Dryer Error Code E:01

Dryer overheating fault due to restricted airflow

Bosch codesBosch dryer codes

Dryer overheating fault due to restricted airflow — lint filter, exhaust duct, or air damper is blocked, or air is leaking past the felt drum seal.

First step from the service manual

Immediately stop dryer by rotating cycle selector knob to Off, open door, remove and clean lint filter, let dryer cool down, then check exhaust duct length and number of elbows.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E:01 means on a Bosch dryer

The E:01 error code on a Bosch dryer indicates an overheating fault caused by restricted or compromised airflow through the drying system. The dryer's thermal monitoring system detects that internal temperatures have exceeded safe operating limits, which triggers this fault to protect the heating element, drum, and surrounding components from heat damage. This is a safety-critical fault that requires immediate attention: the cycle selector must be rotated to the Off position right away.

The root cause is almost always an airflow restriction somewhere in the exhaust path. A clogged lint filter is the most frequent culprit, as lint accumulation across the filter mesh can dramatically reduce the volume of air moving through the drum. Beyond the filter, a kinked, crushed, or excessively long exhaust duct, or one with too many elbow bends, increases back-pressure and traps heat inside the dryer. Air dampers or vent termination caps that are stuck closed or obstructed by debris can produce the same result.

A less obvious but equally important cause is a worn or damaged felt drum seal. This seal runs along the front and rear edges of the drum and is designed to keep airflow channeled through the drum interior and out the exhaust path. When the felt seal deteriorates or pulls away from the drum, conditioned air bypasses the drum entirely, reducing effective airflow and causing heat to build up in unintended areas. Diagnosing this requires physically inspecting the drum seals during a cool-down period after the fault has been triggered.

Source: manufacturer service documentation.

Common causes of E:01

  1. 01

    Clogged lint filter

    Wiring / connection

    A lint filter heavily coated with lint debris restricts the primary airflow path through the drum. Remove the filter and hold it up to light to check for mesh blockage, and clean it thoroughly before restarting.

  2. 02

    Blocked or restricted exhaust duct

    Wiring / connection

    A kinked flexible duct, a duct with too many elbow bends, or an excessively long run increases back-pressure and traps heat inside the dryer. Inspect the full duct run from the dryer to the exterior termination point for obstructions, crushing, or improper routing.

  3. 03

    Obstructed air damper or vent termination cap

    Wiring / connection

    The exterior vent cap or internal air damper can become stuck closed due to lint buildup or debris, preventing exhaust air from escaping. Check that the exterior vent flap opens freely when the dryer runs.

  4. 04

    Worn or damaged felt drum seal

    Part replacement

    The felt seal around the drum edges keeps airflow directed through the drum interior. A deteriorated or separated seal allows air to bypass the drum, reducing effective airflow and causing localized overheating. Inspect the front and rear drum edges for gaps, tears, or missing sections of felt.

  5. 05

    Lint accumulation inside the dryer cabinet

    Wiring / connection

    Over time, lint bypasses the filter and collects inside the cabinet around the blower wheel and heating element area, restricting internal airflow. This typically requires opening the dryer cabinet to inspect and vacuum out accumulated lint.

See the test procedure for each cause

Frequently asked questions about E:01

What does E:01 mean on a Bosch dryer?
E:01 is an overheating fault that indicates the dryer's internal temperature exceeded safe limits due to restricted airflow. The dryer shuts down automatically as a safety measure. Common sources of the restriction include a clogged lint filter, a blocked exhaust duct, a stuck air damper, or a worn felt drum seal that allows air to leak past the drum. The fault must be resolved before the dryer will operate normally again.
How do I fix the E:01 error on my Bosch dryer?
Start by rotating the cycle selector knob to Off immediately, then open the door and remove the lint filter for cleaning. Allow the dryer to cool completely before doing anything else. After cooling, inspect the full length of the exhaust duct for kinks, crushes, or blockages, and check that the exterior vent cap opens freely. If the duct and filter are clear, inspect the felt drum seals for wear or separation, as a damaged seal will need to be replaced.
Is it safe to keep using my dryer when E:01 is showing?
No, continuing to run the dryer with an active E:01 fault is not safe. The code indicates that the dryer has already overheated, and running it again without resolving the airflow restriction risks further heat buildup, which can damage internal components or create a fire hazard. The dryer should remain off until the cause of the restriction is identified and corrected.
Will resetting the dryer clear the E:01 error code?
Rotating the selector knob to Off and allowing the dryer to cool down may allow it to restart, but the E:01 fault will return if the underlying airflow problem has not been fixed. Resetting without addressing the root cause is not a solution. The lint filter, exhaust duct, vent termination, and drum seals must all be inspected and corrected before the dryer will operate reliably without retriggering the fault.
How much does it cost to repair a Bosch dryer showing E:01?
If the fault is caused by a clogged lint filter or a blocked exhaust duct, the repair cost may be minimal, covering only your time or a basic duct cleaning service in the range of $75 to $150. If the felt drum seal is worn and needs replacement, parts and labor costs typically range from $100 to $250 depending on labor rates in your area. More extensive internal lint buildup requiring cabinet disassembly may fall in a similar range for a professional service call.

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