mypros+
Error code reference

Miele Washer Error Code F4015

Frequency converter slip too high (impermissible slip).

Miele codesMiele washer codes

Frequency converter slip too high (impermissible slip).

MyPros+ Max

Get the full diagnostic procedure for F4015.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What F4015 means on a Miele washer

Error code F4015 on a Miele washer indicates that the frequency converter has detected an impermissible slip condition in the drive motor circuit. Slip, in the context of an AC induction motor and its frequency converter, refers to the difference between the synchronous speed of the rotating magnetic field generated by the converter and the actual rotational speed of the motor rotor. Under normal operation, a small, controlled amount of slip is expected and necessary for torque generation. When slip exceeds the converter's programmed threshold, the control system interprets this as a fault condition and halts operation to prevent motor or converter damage.

The frequency converter, sometimes called an inverter or variable frequency drive, regulates motor speed by adjusting the frequency and voltage supplied to the drum motor. When the rotor cannot keep pace with the magnetic field, the slip value rises beyond acceptable limits. This can result from the motor being overloaded, a failing motor winding, degraded motor bearings causing excessive drag, or a fault within the frequency converter module itself. The converter continuously monitors motor feedback and triggers F4015 when the slip differential crosses into the impermissible range.

Diagnosing this fault typically requires checking the drum for mechanical resistance, inspecting motor windings for correct resistance values, examining the wiring harness between the frequency converter and motor for damaged or loose connections, and evaluating the frequency converter module for internal faults. If mechanical and wiring causes are ruled out, the frequency converter or the motor itself may require replacement.

Source: manufacturer service documentation.

Common causes of F4015

  1. 01

    Mechanical drum obstruction or bearing drag

    Part replacement

    Worn drum bearings or a foreign object lodged in the drum or pump can create excessive load on the motor, causing it to lag behind the commanded speed. Try rotating the drum by hand with the machine unplugged to check for roughness or resistance.

  2. 02

    Faulty or failing drive motor

    Part replacement

    Degraded motor windings, worn brushes in brush-type motors, or internal motor shorts can prevent the rotor from reaching the required speed. Motor winding resistance should be measured and compared against specification to identify this fault.

  3. 03

    Frequency converter module failure

    Part replacement

    The frequency converter itself may have developed an internal fault, causing it to incorrectly regulate or measure motor speed. This is indicated when motor and mechanical components test within specification but the fault persists.

  4. 04

    Damaged or loose wiring between converter and motor

    Wiring / connection

    Corroded, broken, or improperly seated connectors in the harness connecting the frequency converter to the motor can cause erratic speed feedback or inconsistent power delivery. Inspect all connectors and wiring for continuity and secure seating.

  5. 05

    Overloaded drum

    Wiring / connection

    An excessively heavy or unbalanced load can demand more torque than the motor can supply at the commanded frequency, pushing slip values above the acceptable limit. Removing items and running a test cycle with a smaller load can help confirm this cause.

See the test procedure for each cause

Frequently asked questions about F4015

What does F4015 mean on a Miele washer?
F4015 indicates that the frequency converter has detected an impermissible slip condition in the motor drive system. Slip refers to the difference between the speed the frequency converter is commanding and the actual rotational speed of the motor. When this difference becomes too large, the washer shuts down to prevent damage to the motor or converter electronics.
Can I fix F4015 on my Miele washer myself?
Some basic checks are within reach for a knowledgeable DIYer, such as confirming the drum is not overloaded, checking that the drum spins freely by hand, and inspecting visible wiring connections for damage or looseness. However, testing motor windings with a multimeter, evaluating the frequency converter module, or replacing components like the motor or converter typically requires technical experience and proper tools. For anything beyond basic checks, a qualified appliance technician is recommended.
Is it safe to use my Miele washer while F4015 is active?
No, you should not attempt to run the washer while this fault is active. The error indicates a problem in the motor drive system, and continued operation could cause further damage to the motor or frequency converter, both of which are costly components. Leave the machine unplugged until the fault has been properly diagnosed and resolved.
How much does it cost to repair a Miele washer with error code F4015?
Repair costs vary depending on the root cause. If the issue is a wiring connection or an overloaded drum, costs may be minimal or limited to a service call fee in the range of $80 to $150. If the drive motor requires replacement, parts and labor can range from $250 to $500 or more. A failed frequency converter module is among the more expensive repairs, potentially ranging from $300 to $600 or higher depending on parts availability and labor rates in your area.
Will resetting my Miele washer clear the F4015 error?
A reset may temporarily clear the fault code, but if the underlying mechanical or electrical problem has not been corrected, the error will return, often during the same or next wash cycle. Resetting without diagnosing and fixing the root cause can also risk additional damage. A reset is only appropriate as a first step after confirming there is no obvious obstruction and after verifying that the drum rotates freely.

Related Miele washer codes

All Miele washer codes
View all 254 Miele washer codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass