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Error code reference

Bosch Dryer Error Code E:11

Overheating (fluffing) level 1

Bosch codesBosch dryer codes

Overheating (fluffing) level 1 — heater temperature rose more than 8°C in 5 seconds 3 times; fluff filter, container or air routes blocked.

First step from the service manual

Clean components and air routes.

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

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What E:11 means on a Bosch dryer

Error code E:11 on a Bosch dryer indicates a Level 1 overheating event in the fluffing (tumbling) phase. The control board monitors the rate of temperature rise inside the drum heating circuit. When the heater temperature climbs more than 8°C within a 5-second window, that constitutes a single overheating event. If this rapid temperature spike occurs three times within a cycle, the control board logs E:11 and halts normal operation. This threshold exists to protect internal components from sustained thermal stress that could damage the heating element, thermistors, or the drum housing itself.

The root cause in virtually all E:11 cases is restricted airflow. The dryer's heating system is calibrated to work within a specific airflow range. When air cannot move freely through the lint filter, the condensate container, or the internal air routes, heat builds up rapidly rather than being distributed and exhausted at the designed rate. The 8°C-in-5-seconds criterion is sensitive enough to detect even partial blockages that might not trigger a full thermal cutout but still represent an abnormal operating condition.

Diagnosing E:11 should begin with a thorough cleaning of all air pathways. This includes removing and rinsing the fluff filter, emptying and cleaning the condensate container, and inspecting the heat exchanger and any ducting for lint accumulation. If the error persists after cleaning, the issue may involve a faulty temperature sensor or a failing heating element that is cycling erratically, both of which would require component-level testing.

Source: manufacturer service documentation.

Common causes of E:11

  1. 01

    Clogged lint (fluff) filter

    Wiring / connection

    A lint filter loaded with debris is the most frequent trigger for E:11. Restricted airflow causes heat to spike rapidly since hot air cannot circulate and exhaust at the correct rate. Remove the filter, clean it thoroughly under running water, and allow it to dry completely before reinstalling.

  2. 02

    Full or dirty condensate container

    Wiring / connection

    On condenser dryers, a full condensate container can impede the moisture and airflow cycle, contributing to heat buildup. Empty and rinse the container, then check that it seats properly when reinserted.

  3. 03

    Blocked heat exchanger or internal air routes

    Wiring / connection

    Lint and debris can accumulate in the heat exchanger compartment and internal ducting over time, severely restricting airflow even when the external filter appears clean. Access and clean the heat exchanger compartment according to the maintenance schedule recommended for the unit.

  4. 04

    Faulty temperature sensor or thermistor

    Part replacement

    If all airflow components are clean and E:11 continues to appear, a temperature sensor reporting inaccurate readings could be causing the control board to incorrectly detect a rapid temperature rise. A technician can test sensor resistance values to confirm proper function.

  5. 05

    Malfunctioning heating element

    Part replacement

    A heating element that is cycling on and off erratically or delivering inconsistent heat output can produce the rapid temperature spikes that trigger E:11. This would typically be accompanied by uneven drying performance and requires element testing and likely replacement.

See the test procedure for each cause

Frequently asked questions about E:11

What does E:11 mean on a Bosch dryer?
E:11 means the dryer detected overheating at the Level 1 threshold during the fluffing or tumbling phase. Specifically, the heater temperature rose more than 8°C within a 5-second window three separate times in a single cycle. This is almost always caused by blocked airflow through the lint filter, condensate container, or internal air routes. Cleaning these components is the first recommended step.
How do I fix E:11 on a Bosch dryer?
Start by removing and thoroughly cleaning the fluff filter, emptying and rinsing the condensate container, and inspecting the heat exchanger compartment and internal air pathways for lint buildup. After cleaning all components, run a test cycle to see if the error returns. If E:11 persists after cleaning, a temperature sensor or heating element fault may be present and should be evaluated by a qualified technician.
Will resetting the dryer clear the E:11 error?
A power reset may clear the error code temporarily and allow the dryer to run again, but if the underlying blockage or component fault is not corrected, E:11 will return. The code is triggered by a repeated pattern of rapid temperature spikes, so clearing it without addressing the root cause means the dryer will likely fault again during the next cycle. Always perform the recommended cleaning steps before or after resetting.
Is it safe to keep using my Bosch dryer when E:11 is showing?
You should not continue running the dryer while E:11 is active and uninvestigated. The error indicates the heating system is reaching temperatures beyond its normal operating range, which poses a potential fire risk if caused by heavy lint accumulation near the heating element. Address the cleaning steps first, and if the error persists after cleaning, stop using the appliance until a technician can inspect it.
How much does it cost to repair a Bosch dryer showing E:11?
If the fix is simply cleaning the lint filter, heat exchanger, and air routes, there is no parts cost involved, though a professional cleaning service call could range from around $75 to $150 depending on your location. If a faulty temperature sensor is the cause, parts and labor together typically fall in the $100 to $250 range. A heating element replacement, including labor, can range from roughly $150 to $350 or more depending on the specific model and local service rates.

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