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Error code reference

Bosch Dryer Error Code E:3070

Water handling system

Bosch codesBosch dryer codes

Water handling system - lint trap full error (direct measurement - flushing time) (4-digit equivalent of E:18).

First step from the service manual

Check / Clean lint filter.

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

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What E:3070 means on a Bosch dryer

Error code E:3070 on a Bosch dryer is the 4-digit equivalent of error E:18 and relates to the water handling system. Specifically, this code is triggered by a direct measurement of flushing time, indicating that the dryer's condensation system is taking longer than expected to flush water through the circuit. In Bosch heat pump and condensation dryers, water removed from the laundry during drying must be routed through the system efficiently. When lint accumulates in the lint trap, airflow through the drum and heat exchanger becomes restricted, causing moisture to build up and the flush cycle to exceed its normal time threshold, which triggers this fault.

The lint trap is the first and most critical component to inspect when this code appears. A clogged lint filter reduces the airflow volume moving through the dryer, which directly impacts how quickly and effectively the system can condense and evacuate moisture. The dryer's control system monitors the duration of the water flushing cycle as a direct measurement, and when that duration is abnormal, it flags E:3070 to alert the user or technician that the water handling process is impaired.

Beyond the lint filter itself, the condensation system components such as the heat exchanger, drain pump, and water collection container can also contribute to this error if they are restricted or malfunctioning. However, since the first diagnostic step is lint filter inspection and cleaning, the vast majority of E:3070 occurrences are resolved by restoring proper airflow through routine maintenance. Persistent errors after cleaning warrant a deeper inspection of the drain path and condensate pump.

Source: manufacturer service documentation.

Common causes of E:3070

  1. 01

    Clogged lint filter

    Wiring / connection

    A lint filter that has not been cleaned regularly is the most frequent trigger for E:3070. Restricted airflow caused by lint buildup forces the flushing cycle to run longer than the allowed time limit, triggering the fault. Remove and clean the filter thoroughly before running another cycle.

  2. 02

    Lint accumulation on the heat exchanger

    Wiring / connection

    Fine lint can bypass the main filter and coat the heat exchanger fins, further restricting airflow and condensation efficiency. This is common in dryers that have not had the heat exchanger cleaned in an extended period and will worsen flushing times even if the lint filter appears clean.

  3. 03

    Blocked or kinked drain hose

    Wiring / connection

    If the dryer drains externally, a blocked, kinked, or improperly routed drain hose can slow or prevent water from evacuating the system, causing the flush time measurement to exceed acceptable limits.

  4. 04

    Faulty or obstructed condensate drain pump

    Part replacement

    The drain pump moves collected water out of the system during flushing. If the pump is obstructed by debris or has failed electrically or mechanically, flushing time will increase significantly and trigger this code.

  5. 05

    Full or improperly seated water collection container

    Wiring / connection

    On models that collect condensate in an internal container, a full or incorrectly reinstalled container can prevent water from being routed properly, contributing to extended flushing times and this error.

See the test procedure for each cause

Frequently asked questions about E:3070

What does E:3070 mean on a Bosch dryer?
E:3070 is a water handling system error indicating that the dryer's flushing cycle is taking longer than expected, as measured directly by the control system. It is the 4-digit equivalent of error E:18. The most common cause is a clogged lint filter restricting airflow and slowing the condensation and water evacuation process. Cleaning the lint filter is the recommended first step to resolve this code.
How do I fix error E:3070 on my Bosch dryer?
Begin by removing the lint filter and cleaning it completely under running water if necessary, then allow it to dry before reinstalling. Also check that the water collection container is empty and properly seated. If the error persists, inspect the heat exchanger for lint buildup and check the drain hose for kinks or blockages. If none of these steps resolve the fault, the condensate drain pump may need to be inspected or replaced.
Is it safe to keep using my Bosch dryer when E:3070 is displayed?
It is not recommended to continue running the dryer while this error is active. The fault indicates that water is not being evacuated efficiently, which can reduce drying performance and potentially cause moisture-related issues inside the appliance over time. Resolve the underlying cause before resuming normal use.
Will resetting my Bosch dryer clear the E:3070 error?
A reset may temporarily clear the error code from the display, but it will return if the underlying issue is not addressed. Because the code is triggered by a direct measurement of flushing time, the dryer will detect the same problem on the next cycle if the lint filter or drainage path has not been cleaned or repaired. Always fix the root cause before relying on a reset.
How much does it cost to repair a Bosch dryer showing E:3070?
If the fix is simply cleaning the lint filter or heat exchanger, there is no parts cost involved and only your time is required. If the condensate drain pump needs replacement, parts alone typically range from around 40 to 120 dollars depending on the model, with professional labor adding an additional 80 to 200 dollars or more depending on your location and service provider. Many E:3070 errors are resolved with no parts cost at all through routine cleaning.

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