mypros+
Error code reference

Miele Washer Error Code F4022

Dryer lint filter flap is open or switch S22 is defective or leads open-circuited.

Miele codesMiele washer codes

Dryer lint filter flap is open or switch S22 is defective or leads open-circuited.

MyPros+ Max

Get the full diagnostic procedure for F4022.

  • 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 F4022 means on a Miele washer

Error code F4022 on a Miele washer indicates a fault related to the dryer lint filter flap. Specifically, the control system has detected that the lint filter flap is reported as open when it should be closed, or that switch S22, which monitors the position of this flap, is defective. The third possibility is that the wiring leads connected to switch S22 have developed an open circuit, breaking the signal path between the switch and the main control board. This is a safety and function monitoring circuit, designed to confirm that the lint filter flap is properly seated before or during a drying cycle.

Switch S22 is a position-sensing switch that sends a closed or open circuit signal to the control board depending on the physical state of the lint filter flap. When the flap is properly closed, S22 completes the circuit and the control allows operation to proceed. If the flap is ajar, physically damaged, or if S22 itself has failed internally, or if the wiring harness to S22 has a break or corroded connector, the control board reads the circuit as open and triggers F4022. This prevents the machine from operating in a potentially unsafe or inefficient state.

Diagnosing F4022 requires a systematic approach: first confirm the lint filter flap is fully closed and undamaged, then inspect the wiring harness and connectors leading to S22 for breaks, corrosion, or loose terminals. If wiring checks out, switch S22 itself should be tested for continuity in both the open and closed positions using a multimeter. A properly functioning switch will show a clear transition between open and closed circuit states as the flap is moved.

Source: manufacturer service documentation.

Common causes of F4022

  1. 01

    Lint filter flap not fully closed

    Wiring / connection

    The most straightforward cause is that the lint filter flap is physically ajar or has not been fully latched after cleaning. Inspect the flap and press it firmly closed to see if the error clears.

  2. 02

    Defective switch S22

    Part replacement

    Switch S22 may have failed internally, causing it to report an open circuit even when the flap is correctly closed. Test S22 for continuity with a multimeter: the switch should change state as the flap opens and closes.

  3. 03

    Open circuit in the wiring leads to S22

    Wiring / connection

    A break, corroded terminal, or loose connector in the wiring harness between switch S22 and the control board will cause the control to read a permanent open circuit. Visually inspect the harness and test lead continuity with a multimeter.

  4. 04

    Damaged or warped lint filter flap

    Part replacement

    Physical damage, warping, or debris buildup on the lint filter flap can prevent it from seating properly against the switch actuator. Inspect the flap and its housing for visible damage or obstructions.

  5. 05

    Corroded or damaged connector at S22

    Wiring / connection

    The connector body at S22 may have corroded pins or a damaged locking tab, resulting in an intermittent or permanent loss of contact. Inspect the connector closely and clean or replace it as needed.

See the test procedure for each cause

Frequently asked questions about F4022

What does F4022 mean on a Miele washer?
F4022 indicates that the control board has detected the dryer lint filter flap as open, or that switch S22, which monitors the flap position, is defective or has an open circuit in its wiring leads. The machine uses this switch as a safety check before allowing drying operation to proceed. The fault points to either a physical problem with the flap itself, a failed switch, or a wiring issue in the circuit.
Can I fix F4022 myself without a technician?
If the lint filter flap is simply not fully closed, you can resolve the error yourself by pressing it firmly shut and restarting the machine. Inspecting the wiring harness and connectors for obvious damage or corrosion is also within reach for a confident DIYer. However, replacing switch S22 or diagnosing intermittent wiring faults may require disassembly and a multimeter, which is better suited to someone with appliance repair experience.
Is it safe to keep using my Miele washer when F4022 is displayed?
The machine will typically not allow the affected cycle to continue when F4022 is active, which is a built-in safety measure. You should not attempt to bypass or ignore this fault, as the lint filter flap monitoring circuit exists to prevent operation in an unsafe condition. Address the underlying cause before resuming use.
Will resetting the machine clear the F4022 error?
A reset may temporarily clear the displayed code, but if the underlying fault with the flap, switch S22, or the wiring has not been corrected, the error will return when the machine attempts the relevant cycle again. A lasting fix requires identifying and resolving the root cause, not just clearing the code.
How much does it cost to repair a Miele washer showing F4022?
If the fix is simply closing or reseating the lint filter flap, there is no parts cost involved. Replacing switch S22 or a damaged wiring harness section will add parts costs, typically in the range of $20 to $80 for the switch depending on the model, plus labor if a technician is needed. A full diagnostic service call from a Miele-certified technician generally runs in the range of $100 to $200 before parts.

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