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Error code reference

Bosch Washer Error Code Er:10

Flow meter gives wrong values

Bosch codesBosch washer codes

Flow meter gives wrong values — faulty flow meter or wire harness.

First step from the service manual

Run test P11; check flow meter and wire harness.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What Er:10 means on a Bosch washer

Er:10 on a Bosch washer indicates that the flow meter is returning values outside of the expected range. The flow meter, also called a water meter or pulse counter, is a turbine-based sensor positioned in the cold water inlet path. As water flows through it, the spinning turbine generates electrical pulses that the control board counts to measure how much water has entered the drum. When those pulse signals are absent, irregular, or inconsistent with what the control board expects during a fill cycle, Er:10 is triggered.

The two primary sources of this fault are the flow meter itself and the wire harness connecting it to the control board. A failed or sluggish turbine inside the flow meter, caused by mineral scale buildup, debris obstruction, or a cracked housing, will produce erratic or missing pulse signals. On the wiring side, a broken conductor, corroded terminal, or loose connector between the flow meter and the control board can interrupt signal transmission and produce the same error.

The recommended starting point for diagnosis is test P11, which is a service mode routine that exercises the flow meter directly and allows technicians to observe whether the sensor is producing valid output. During this test, inspect the wire harness along its full length for pinched sections, chafed insulation, or corrosion at the connector pins. If the harness checks out and P11 confirms no signal from the sensor, the flow meter assembly is the likely failed component.

Source: manufacturer service documentation.

Common causes of Er:10

  1. 01

    Faulty flow meter sensor

    Part replacement

    The turbine inside the flow meter can become jammed with sediment or mineral deposits, or the sensor electronics can fail outright, causing it to produce no pulses or erratic signals. Running test P11 will confirm whether the sensor is generating any output.

  2. 02

    Damaged or disconnected wire harness

    Wiring / connection

    A broken wire, corroded terminal pin, or loose connector in the harness between the flow meter and control board will interrupt the pulse signal without any fault in the sensor itself. Inspect the full length of the harness and all connectors for visible damage or corrosion.

  3. 03

    Mineral scale or debris blocking the flow meter

    Wiring / connection

    In hard water areas, scale buildup inside the flow meter housing can restrict or stop turbine rotation, reducing or eliminating pulse output. Removing and inspecting the meter for obstruction is a good early step before ordering parts.

  4. 04

    Corroded or loose connector at the control board

    Wiring / connection

    The connector where the flow meter harness plugs into the main control board can develop corrosion or a poor seating connection, causing intermittent or total signal loss. Reseating or cleaning the connector may resolve the fault without replacing any components.

  5. 05

    Failed main control board

    Part replacement

    If the flow meter and harness both test correctly during P11 diagnostics, the control board's input circuit for the flow meter signal may have failed. This is the least common cause and should only be considered after the sensor and wiring are ruled out.

See the test procedure for each cause

Frequently asked questions about Er:10

What does Er:10 mean on a Bosch washer?
Er:10 indicates that the flow meter is sending incorrect or no signal to the washer's control board. The flow meter is a pulse-generating sensor that tracks how much water enters the drum during a fill cycle. This error points to either a defective flow meter or a problem with the wire harness connecting it to the control board.
Can I fix Er:10 myself or do I need a technician?
A knowledgeable DIYer can inspect the wire harness for visible damage, check connectors for corrosion, and clean a debris-clogged flow meter without professional help. However, running the P11 diagnostic test and accurately interpreting sensor output typically requires familiarity with appliance service modes. If parts need to be replaced, a technician can ensure the correct component is identified before purchasing.
Is it safe to keep using my washer when Er:10 appears?
It is not recommended to continue running the washer with this error active. Because the flow meter controls water measurement, a faulty reading could cause the machine to overfill or behave unpredictably during fill cycles. Stop using the washer until the fault is diagnosed and resolved.
Will resetting the washer clear the Er:10 error?
A reset may temporarily clear the error code from the display, but it will not resolve the underlying hardware fault. If the flow meter or wiring is defective, the error will return as soon as the washer attempts a fill cycle and the control board detects invalid sensor data again. A proper diagnostic using test P11 is needed to identify and fix the root cause.
How much does it cost to repair Er:10 on a Bosch washer?
Repair costs vary depending on the failed component. If only the wire harness needs repair or a connector needs reseating, costs may be minimal, primarily covering labor time. A replacement flow meter part typically ranges from $20 to $80 depending on the model, while a main control board replacement is significantly more expensive, often between $150 and $350 for parts alone, plus labor if a technician is used.

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