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Error code reference

Bosch Washer Error Code 18

Pumping time exceeded

Bosch codesBosch washer codes

Pumping time exceeded - pump is blocked or broken, pressure sensor broken, hose to pressure sensor blocked, draining hose blocked.

First step from the service manual

Reset error with OFF and ON, check components, check wire harness.

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

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What 18 means on a Bosch washer

Error code 18 on a Bosch washer indicates that the pumping time has been exceeded during a drain cycle. The control board monitors how long the drain pump runs to evacuate water from the drum. When the pump operates longer than the permitted time without successfully draining the machine, the board logs error 18 and halts the cycle. This protection exists to prevent motor burnout and to alert the user that something is interfering with normal water evacuation.

The most direct cause is a blocked or failed drain pump. Foreign objects such as coins, lint, or debris can lodge in the pump impeller and prevent it from spinning freely, reducing or eliminating flow. A pump that has failed electrically will also trigger this fault. Beyond the pump itself, the pressure sensor system is involved in this error: a faulty pressure sensor or a blocked hose connecting the pressure sensor to the tub can cause the control board to misread water levels, leading it to believe draining is incomplete even when the drum is empty.

The drain hose routing is another common factor. If the standpipe connection is too low, too high, or the hose is kinked or clogged, water cannot exit efficiently and pumping time extends beyond the threshold. The wire harness connecting the pump and pressure sensor to the control board should also be inspected for damaged, corroded, or loose terminals, as an intermittent electrical connection can mimic component failure and trigger this code.

Source: manufacturer service documentation.

Common causes of 18

  1. 01

    Blocked drain pump

    Wiring / connection

    Debris such as coins, hair, or small garments can jam the pump impeller and prevent proper water flow. Remove and clean the pump filter and inspect the impeller for obstructions.

  2. 02

    Blocked or kinked drain hose

    Wiring / connection

    A hose that is kinked, clogged with lint, or installed at an incorrect height will restrict water flow and cause pumping time to exceed the limit. Straighten the hose, check the standpipe height, and clear any blockage.

  3. 03

    Failed drain pump

    Part replacement

    If the pump impeller is clear but the pump still does not run or produces no flow, the pump motor may have burned out electrically. Check for power at the pump terminals and replace the pump if it is not receiving or responding to voltage.

  4. 04

    Faulty or blocked pressure sensor or hose

    Part replacement

    The pressure sensor monitors water level and signals the control board when the drum is empty. A clogged sensor hose or a defective sensor can cause the board to incorrectly conclude that water remains in the drum even after a successful drain.

  5. 05

    Damaged wire harness

    Wiring / connection

    Corroded, broken, or loose wiring connections between the pump, pressure sensor, and control board can cause intermittent or absent signals that trigger this error. Inspect the harness and connectors for visible damage or poor seating.

See the test procedure for each cause

Frequently asked questions about 18

What does 18 mean on a Bosch washer?
Error 18 means the drain pump ran longer than the allowable time without successfully emptying the drum. The washer stops the cycle to protect itself. Common causes include a blocked pump, a clogged or kinked drain hose, a defective pressure sensor, or a failed pump motor.
Will resetting my Bosch washer clear error 18?
Turning the washer off and back on can reset the error and allow the cycle to restart, which is the recommended first step. However, if the underlying cause such as a clog or faulty component is not resolved, the error will return. Always inspect the pump filter, drain hose, and pressure sensor hose before assuming a reset has fixed the problem.
How do I fix error 18 on a Bosch washer?
Start by resetting the machine, then check the drain pump filter for debris and clear any blockage. Inspect the drain hose for kinks or clogs and verify it is installed at the correct height. If the pump filter and hose are clear, check the pressure sensor hose for blockage and test the pump and wiring harness for electrical faults. Replace any confirmed failed components.
Is it safe to continue using my Bosch washer when error 18 appears?
No, you should not continue running the washer until the issue is resolved. The machine stops automatically to prevent pump motor burnout and potential water overflow. Continuing to force cycles could cause additional damage to the pump or control board.
How much does it cost to repair a Bosch washer showing error 18?
If the fix is simply clearing a clog from the pump filter or drain hose, the repair costs nothing beyond your time. A replacement drain pump typically costs between 40 and 120 dollars for the part, with professional labor adding 80 to 200 dollars depending on your area. A faulty pressure sensor is generally less expensive, usually ranging from 20 to 60 dollars for the part.

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