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Error code reference

Bosch Dryer Error Code E:04

Drying cycle time overdue

Bosch codesBosch dryer codes

Drying cycle time overdue - maximum drying time exceeded (>5h) (Error).

First step from the service manual

User must reduce load.

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

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What E:04 means on a Bosch dryer

The E:04 error code on a Bosch dryer indicates that the drying cycle has exceeded the maximum allowable drying time of five hours. This is a protective control function built into the dryer's electronic control system. The machine monitors total cycle duration and triggers this error when a load fails to reach the target dryness level within the five-hour window. The code is classified as an Error, meaning the cycle will not complete normally and the machine will halt operation.

The most common root cause is an oversized or excessively dense load that restricts airflow and heat distribution throughout the drum. When moisture cannot be efficiently evaporated and exhausted, drying times extend well beyond normal parameters. Secondary causes include restricted exhaust ducting, a partially blocked lint filter, or a failing heating element that reduces thermal output. All of these conditions force the machine to run longer than the five-hour threshold allows.

Diagnosing this error starts with the load itself, as the first recommended step is to reduce the load size. If the error recurs with normal load sizes, the technician should inspect the exhaust duct for kinks, blockages, or excessive length, and verify the lint screen is clean. Further investigation into heating components and airflow sensors may be warranted if the error persists after addressing load size and ventilation.

Source: manufacturer service documentation.

Common causes of E:04

  1. 01

    Overloaded drum

    Wiring / connection

    Too many items packed into the drum restrict airflow and prevent even heat distribution, causing drying times to stretch far beyond normal. Check that the load fills no more than about two-thirds of the drum capacity.

  2. 02

    Blocked or dirty lint filter

    Wiring / connection

    A lint filter clogged with debris reduces the airflow needed to carry moisture out of the drum, significantly extending cycle time. Remove and clean the lint screen before every cycle.

  3. 03

    Restricted or kinked exhaust duct

    Wiring / connection

    A blocked, kinked, or excessively long exhaust duct limits the dryer's ability to expel moist air, causing the machine to run indefinitely without reaching dryness targets. Inspect the full duct run from the dryer to the exterior vent opening.

  4. 04

    Reduced heating output

    Part replacement

    A failing heating element or thermal component that delivers lower-than-normal heat output will cause the dryer to take much longer to evaporate moisture from the load. If the drum feels only slightly warm during operation, further diagnosis of the heating circuit is needed.

  5. 05

    Moisture sensor contamination

    Wiring / connection

    Residue from dryer sheets or fabric softener can coat the moisture sensor strips inside the drum, causing them to misread the actual dryness level and extend the cycle unnecessarily. Clean the sensor bars with a mild rubbing alcohol and a soft cloth.

See the test procedure for each cause

Frequently asked questions about E:04

What does E:04 mean on a Bosch dryer?
E:04 means the dryer ran for more than five hours without completing the drying cycle, which is the maximum time the control system permits. The machine stops and displays this error to protect itself and signal that something prevented normal drying. The most common reason is an overloaded drum, but restricted venting and heating issues can also trigger this code.
How do I fix the E:04 error on my Bosch dryer?
Start by reducing the load size, splitting large loads into two smaller ones if necessary. Clean the lint filter and inspect the exhaust duct for blockages or kinks. If the error continues with correctly sized loads and clear venting, inspect the heating circuit and moisture sensor bars for faults.
Will resetting my Bosch dryer clear the E:04 error?
A power reset may clear the displayed error code temporarily, but it will not resolve the underlying cause. If the same load size, venting restriction, or heating problem remains, the dryer will exceed five hours again and the E:04 error will return. Address the root cause before restarting the machine.
Is it safe to keep using my dryer when E:04 appears?
The dryer halts operation when E:04 is triggered, so it will not continue running on its own. It is not advisable to repeatedly force cycles without addressing the cause, as restricted airflow and extended run times can create heat buildup. Resolve the load size or venting issue before running the machine again.
How much will it cost to repair a Bosch dryer showing E:04?
If the cause is an overloaded drum or a dirty lint filter, there is no repair cost at all. Exhaust duct cleaning or replacement typically runs in the range of $50 to $150 depending on duct length and accessibility. If a heating element or control component needs replacement, repair costs generally range from $150 to $350 including parts and labor.

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