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Error code reference

Miele Washer Error Code F4151

No water level increase within 5 min (300s intake without ≥10mm wc increase); water intake blocked, ADS…

Miele codesMiele washer codes

No water level increase within 5 min (300s intake without ≥10mm wc increase); water intake blocked, ADS defective, air path leaking, or drain valve not closing.

First step from the service manual

Check analog pressure sensor, air path from suds container, air trap, hose, branch piece, B1-14, imbalance sensor, drain valve.

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

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What F4151 means on a Miele washer

F4151 is a water intake fault triggered when the control unit detects no meaningful increase in water level after 300 seconds of continuous fill. Specifically, the system monitors the analog pressure sensor (ADS) and expects to see at least a 10mm water column rise during an active intake cycle. If that threshold is not reached within 5 minutes, the machine halts and stores F4151. The fault points to a failure somewhere in the water intake or level-sensing circuit, not necessarily a single component.

The pressure sensing system relies on an air trap connected to the suds container via a hose and branch piece. Air trapped in this sealed path compresses as water rises, and the ADS converts that pressure change into a water-level signal. If the air path has a leak, a blockage, or a disconnected hose, the ADS receives an inaccurate signal and may report no level increase even when water is actually entering the drum. A failed or out-of-range ADS itself produces the same symptom.

Beyond the sensing circuit, the fault can originate in the water supply or the drain valve. A partially closed inlet valve, kinked supply hose, or low water pressure can physically prevent adequate fill. A drain valve that fails to close completely will allow water to exit as fast as it enters, producing a flat pressure reading. The imbalance sensor (B1-14) is also listed for inspection, as it shares diagnostic relevance in this circuit. Technicians should inspect all these components systematically before replacing any single part.

Source: manufacturer service documentation.

Common causes of F4151

  1. 01

    Blocked or kinked water intake

    Wiring / connection

    A kinked supply hose, closed shutoff valve, or clogged inlet screen can restrict water flow enough that the drum never fills adequately within the 300-second window. Check that the supply tap is fully open and inspect the hose and inlet filter for blockages.

  2. 02

    Drain valve not closing fully

    Part replacement

    If the drain valve stays partially open, water exits the tub as quickly as it enters, keeping the water level flat and triggering F4151. Inspect the drain valve for debris holding it open or for electrical faults preventing full closure.

  3. 03

    Leaking or disconnected air path

    Wiring / connection

    The pressure sensing circuit depends on a sealed air path running from the suds container through a hose and branch piece to the ADS. A crack, loose connection, or blockage in this path causes the sensor to misread the actual water level. Inspect the entire air path for splits, disconnections, or moisture contamination.

  4. 04

    Defective analog pressure sensor (ADS)

    Part replacement

    If the ADS itself is faulty, it cannot accurately report water column pressure changes to the control board, and the machine will fault even with normal water flow. Resistance and voltage output of the ADS should be checked against specification before replacing.

  5. 05

    Clogged or damaged air trap

    Wiring / connection

    The air trap at the base of the suds container can become blocked with detergent residue or debris, preventing pressure changes from reaching the ADS through the hose. Remove and clean the air trap, then verify the connected hose is clear and undamaged.

See the test procedure for each cause

Frequently asked questions about F4151

What does F4151 mean on a Miele washer?
F4151 means the washer ran a fill cycle for 300 seconds but the analog pressure sensor did not detect a water level increase of at least 10mm water column. The machine stopped to protect itself from running dry. The fault can come from a blocked water supply, a drain valve that is not sealing, a leak in the pressure sensing air path, or a defective ADS pressure sensor.
Can I fix F4151 myself, or do I need a technician?
Some causes of F4151 are DIY-friendly, such as checking that the water supply tap is fully open, inspecting the inlet hose for kinks, and cleaning the air trap. If those checks do not resolve the fault, diagnosing the drain valve, ADS sensor, and air path connections requires disassembly and some electrical testing, which is better handled by a qualified technician.
Will resetting the washer clear the F4151 error?
Resetting the machine may temporarily clear the code, but the fault will return as soon as the washer attempts another fill cycle if the underlying problem is not corrected. A reset is only useful for confirming whether the issue is intermittent. The root cause in the intake system or pressure sensing circuit must be addressed for the error to stay cleared.
Is it safe to use my Miele washer while F4151 is active?
No. The washer halts the cycle specifically to prevent operating without a verified water level. Attempting to bypass the fault or run a cycle with inadequate water can damage the pump, heating element, and drum bearings. The fault should be diagnosed and repaired before resuming normal use.
How much does it cost to repair a Miele washer with error code F4151?
Repair costs vary widely depending on the faulty component. If the fix is simply clearing a blocked inlet filter or reconnecting an air hose, labor costs alone may be in the range of $75 to $150. Replacing a drain valve or ADS pressure sensor typically adds $50 to $200 in parts, and total repair bills including labor often fall between $150 and $400 depending on your location and the specific parts needed.

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