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Error code reference

Miele Washer Error Code F4155

Drainage fault during spinning; control interrupts spinning when water level increase of ≥50 mm wc is…

Miele codesMiele washer codes

Drainage fault during spinning; control interrupts spinning when water level increase of ≥50 mm wc is registered.

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What F4155 means on a Miele washer

F4155 is a drainage fault that occurs specifically during the spin cycle. The Miele washer's control board continuously monitors water level via a pressure sensor (also called a pressure switch or water level sensor). When the control detects a water level increase of 50 mm water column or greater during spinning, it interprets this as a drainage failure and immediately interrupts the spin cycle to prevent damage or flooding.

The core issue is that water should be actively draining or already fully drained before and during spinning. A rising water level at this stage points to a blockage or failure in the drain system. The most likely culprits include a clogged drain pump filter, a kinked or obstructed drain hose, a failed drain pump, or a faulty pressure sensor sending incorrect readings to the control board. In some cases, a partial blockage that allowed earlier cycle phases to complete can worsen under the centrifugal forces of spinning, causing water to back up and trigger the fault.

Because the control uses a millimeter water column threshold to define the fault, the pressure sensor itself is a critical component in this diagnostic chain. If the sensor is drifting or has moisture contamination in its tubing, it may report a rising water level even when drainage is functioning correctly. Technicians should verify actual water presence in the drum before assuming a drain system failure, and inspect the pressure sensor hose for blockages or disconnection.

Source: manufacturer service documentation.

Common causes of F4155

  1. 01

    Clogged drain pump filter

    Wiring / connection

    Lint, debris, and small objects accumulate in the drain pump filter and restrict water flow. This is the most frequent cause and should be checked first by removing and cleaning the filter, typically located behind a front access panel.

  2. 02

    Blocked or kinked drain hose

    Wiring / connection

    The drain hose may be kinked, crushed, or partially blocked by debris, preventing adequate water discharge during the spin phase. Inspect the full length of the hose from the machine to the standpipe or sink connection.

  3. 03

    Failed drain pump

    Part replacement

    If the drain pump motor has failed or the impeller is jammed by a foreign object, water cannot be expelled and will rise as the drum moves. Listen for the pump running during a drain cycle and check for continuity across the pump motor terminals.

  4. 04

    Faulty pressure sensor or blocked sensor hose

    Part replacement

    The pressure sensor monitors water level using a small hose connected to the drum. If this hose is blocked, kinked, or disconnected, the sensor may falsely report a 50 mm wc water level increase and trigger F4155 even when drainage is normal.

  5. 05

    Standpipe or household drain blockage

    Wiring / connection

    A blockage in the home plumbing standpipe can cause water to back up into the machine's drain hose, registering as a rising water level. Check whether other nearby drains are slow or backed up.

See the test procedure for each cause

Frequently asked questions about F4155

What does F4155 mean on a Miele washer?
F4155 indicates a drainage fault detected during the spin cycle. The washer's control board monitors water level continuously, and when it registers an increase of 50 mm water column or more during spinning, it halts the spin cycle. This means water is not draining properly when it should be, pointing to a blockage or component failure in the drain system.
Can I fix F4155 on my Miele washer myself?
In many cases, yes. Start by cleaning the drain pump filter, which is accessible behind the front lower panel, and inspect the drain hose for kinks or blockages. If the filter and hose are clear, the issue may involve the drain pump or pressure sensor, which typically require more technical skill and possibly replacement parts. If basic checks do not resolve the fault, a qualified technician should inspect the pump and pressure sensor.
Is it safe to use my Miele washer while F4155 is active?
No, you should not continue running the washer while this fault is active. The machine has stopped the spin cycle because it detected water rising when it should not be. Running further cycles risks water remaining in the drum, potential overflow, and additional stress on the drain pump. Resolve the drainage issue before resuming use.
Will resetting my Miele washer clear the F4155 error?
A reset may temporarily clear the displayed fault code, but it will not resolve the underlying drainage problem. If the cause of the water level increase is not corrected, the fault will return as soon as the washer reaches the spin cycle again. Address the drain filter, hose, pump, and pressure sensor before attempting a reset.
How much does it cost to repair a Miele washer F4155 error?
If the fix is simply cleaning a clogged drain filter, the cost is minimal, typically just your time or a small service call fee. If the drain pump needs replacement, parts and labor can range from around 150 to 350 dollars or more depending on your location and service provider. A faulty pressure sensor is generally on the lower end of parts cost, but diagnostic labor fees will apply regardless of the component replaced.

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