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OEM VERIFIED BENCH
OFFICIAL FAULT CODEF4012
Miele
Miele // OFFICIAL DIAGNOSTIC BENCH

Miele Dishwasher F4012

DishwasherDrive Motor, Inverter & Tachometer Sensor
Premium built-in dishwasher with open illuminated stainless steel interior and precision spray arms
Dishwasher
Select Appliance Type
0ms Instant Telemetry Switch

Symptom / Description

FAULT

The motor tries to start then stops immediately, or the device cuts out during rapid rotation phases.

TELEMETRY // LIVESIG: FAULT_DETECTED

Root Cause

ROOT CAUSE

The frequency converter detects an abnormal motor overcurrent, due to a mechanical blockage, a short circuit in the windings or a drive fault.

CIRCUIT // SUBSYSTEMLOGIC: ROOT_ISOLATED

Repair Instructions

UNLOCKED
1With the power off, rotate the drum by hand to feel for resistance. Measure the resistance of the motor windings with the ohmmeter. If the motor is compliant, the drive is defective.
AI diagnostic workshop engine analyzing appliance circuit schematics and error telemetry in real time
AI WORKSHOP PROTOCOL ENGINE
Direct extraction from OEM factory manuals & wiring schematics

Field Actions

DISPATCH
Need Help? Call a Certified TechnicianWorldwide Miele Parts Finder
Electrical & Safety Protocol

Always disconnect appliance from 230V/400V mains before opening panels. Use CAT III multimeter for circuit testing.

SWISS ATELIER TECHNICAL BLUEPRINT // 2026 SCHEMATIC STANDARD

Drive Motor, Inverter & Tachometer Loop

3-Phase BLDC Stator U-V-W, Inverter IPM Module & Tachometer G1

CALIBRATED TEST POINTS (TP1 / TP2)
ACTIVE MULTIMETER BENCH
MAIN PCB CONTROLLER32-BIT MCUFIRMWARE v26.4SOLID-STATE RELAYTRIAC TY1 // 16A 600V230V AC MAINSLINE FILTER L-NJ1J2TP1TP2PRECISION BENCH METERAUTO-RANGE ΩCAT III8.2 Ω (U-V)VΩCOM3-PHASE BLDC MOTOR M1ROTORUVWTACHO G1 (60-120Ω)
Target Component
3-Phase Motor Windings / Tacho Generator / Carbon Brushes
Nominal Resistance / Test Range
3Ω–6Ω (BLDC phase U-V-W) / 60Ω–180Ω (Tacho coil) / 1.5Ω–3.5Ω (Universal stator)
Test Harness Pins
Across phase pins U-V, V-W, U-W on motor harness; across tacho pins
Diagnostic Verification Rule
Unbalanced phase winding resistance indicates burned stator. OL on tachometer causes instant drum shutdown.
CALIBRATED BENCH PROTOCOL // CAT III 600V

Workshop Verification & Safety Checklist

WORKSHOP VERIFICATION PROTOCOLDrive Motor, Inverter & Tachometer SensorDishwasher
2. Multimeter & Electrical Bench Tests (Ω)
MODE: OHMMETER (Ω)AUTO-RANGE
Precision digital multimeter probes measuring electrical resistance in Ohms on an appliance control board
CALIBRATED METROLOGY RESISTANCE BENCH (CAT III)
Nominal Resistance (Ω)
3Ω–6Ω (BLDC phase U-V-W) / 60Ω–180Ω (Tacho coil) / 1.5Ω–3.5Ω (Universal stator)NOMINAL
0 Ω (SHORT)CALIBRATED BAND∞ OL (OPEN)
▲ NOMINAL OPERATING WINDOW
Target Component:3-Phase Motor Windings / Tacho Generator / Carbon Brushes
Test Pins & Connections
PROBE (+)
PROBE (-)
Across phase pins U-V, V-W, U-W on motor harness; across tacho pins
Tolerance & Diagnostic CriteriaBLDC phase winding values must be strictly balanced within ±0.3Ω. Hand rotation generates 1V–4V AC on tacho.
1. Pre-Intervention Electrical Safety Protocols
  • !High-Voltage Safety Protocol & DC Bus: Wait at least 5 minutes after power cutoff to allow inverter DC bus capacitors (380V DC) to bleed down.
  • !Verify 0V DC across inverter filter capacitors before unplugging motor harness connectors.
  • !Keep hands clear of drive belt and pulleys during any manual rotation tng.
3. Preliminary Mechanical & Visual Checks
  • Slip off drive belt and spin drum/motor shaft by hand to check for roaring or seized ball bearings.
  • For universal motors: verify carbon brushes have at least 10mm remaining length and smooth contact faces.
  • Inspect motor suspension rubber mounts and drive belt tension/groove profile.
Perform these diagnostic steps before triggering AI Deep Search or replacing boards.Certified Workshop Routine

Frequently Asked Questions: Miele F4012

FAQ TREE
What does error code F4012 mean on a Miele appliance?

Miele error code F4012 indicates: The motor tries to start then stops immediately, or the device cuts out during rapid rotation phases..

What is the root cause of Miele error code F4012?

The primary root cause for Miele code F4012 is: The frequency converter detects an abnormal motor overcurrent, due to a mechanical blockage, a short circuit in the windings or a drive fault..

How do I fix or resolve Miele error code F4012?

To resolve error code F4012: With the power off, rotate the drum by hand to feel for resistance. Measure the resistance of the motor windings with the ohmmeter. If the motor is compliant, the drive is defective.

Is it safe to clear Miele error code F4012 by resetting power?

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Miele code F4012 persists, the physical component causing The frequency converter detects an abnormal motor overcurrent, due to a mechanical blockage, a short circuit in the windings or a drive fault. must be inspected or replaced.

How do I test electrical resistance for Miele code F4012 using a multimeter?

Set a digital multimeter to ohms (Ω). Disconnect power and test 3-Phase Motor Windings / Tacho Generator / Carbon Brushes across Across phase pins U-V, V-W, U-W on motor harness; across tacho pins. Expected nominal reading is 3Ω–6Ω (BLDC phase U-V-W) / 60Ω–180Ω (Tacho coil) / 1.5Ω–3.5Ω (Universal stator). Tolerance: BLDC phase winding values must be strictly balanced within ±0.3Ω. Hand rotation generates 1V–4V AC on tacho..

What safety protocol must be followed before servicing Miele code F4012?

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.

What does Miele error code F4012 mean on a Dishwasher?

Miele error code F4012 on a Dishwasher indicates: The motor tries to start then stops immediately, or the device cuts out during rapid rotation phases.. Primary cause: The frequency converter detects an abnormal motor overcurrent, due to a mechanical blockage, a short circuit in the windings or a drive fault.. Recommended solution: With the power off, rotate the drum by hand to feel for resistance. Measure the resistance of the motor windings with the ohmmeter. If the motor is compliant, the drive is defective..

What does Miele error code F4012 mean on a Tumble Dryer?

Miele error code F4012 on a Tumble Dryer indicates: The motor tries to start then stops immediately, or the device cuts out during rapid rotation phases.. Primary cause: The frequency converter detects an abnormal motor overcurrent, due to a mechanical blockage, a short circuit in the windings or a drive fault.. Recommended solution: With the power off, rotate the drum by hand to feel for resistance. Measure the resistance of the motor windings with the ohmmeter. If the motor is compliant, the drive is defective..

Community Verification

COMMUNITY

Did this solution resolve the issue?

Miele F4012 — Multi-Appliance Technical Reference

Verified OEM diagnostic specifications across all appliance systems sharing this fault code.

Miele F4012 — Dishwasher

[ACTIVE]
Symptom / Description:

The motor tries to start then stops immediately, or the device cuts out during rapid rotation phases.

Root Cause:

The frequency converter detects an abnormal motor overcurrent, due to a mechanical blockage, a short circuit in the windings or a drive fault.

Repair Instructions:

With the power off, rotate the drum by hand to feel for resistance. Measure the resistance of the motor windings with the ohmmeter. If the motor is compliant, the drive is defective.

Miele F4012 — Dryer

Symptom / Description:

The motor tries to start then stops immediately, or the device cuts out during rapid rotation phases.

Root Cause:

The frequency converter detects an abnormal motor overcurrent, due to a mechanical blockage, a short circuit in the windings or a drive fault.

Repair Instructions:

With the power off, rotate the drum by hand to feel for resistance. Measure the resistance of the motor windings with the ohmmeter. If the motor is compliant, the drive is defective.

SEMANTIC KNOWLEDGE GRAPH // MIELE

Related Miele Dishwasher Error Codes

Diagnostic Link Mesh14 OEM Cross-References

Cross-referenced diagnostic codes for technicians inspecting similar component subsystems.

F4013Dishwasher
Drive Motor, Inverter & Tachometer Sensor
The device reports an error and the motor does not operate properly, especially under load.
Inspect Protocol
F4014Dishwasher
Heating Element, Thermostat & Safety Fuse
The appliance stops suddenly, typically during spin deceleration.
Inspect Protocol
F4015Dishwasher
Drive Motor, Inverter & Tachometer Sensor
The motor struggles to reach its set speed or its rotation speed fluctuates abnormally.
Inspect Protocol
F4016Dishwasher
General System & Mechanical Integration
The spinning phase is interrupted or never reaches the maximum speed selected.
Inspect Protocol
F4017Dishwasher
Drainage System & Drain Pump
The program stops at a predefined step, usually before the final drain.
Inspect Protocol
F4018Dishwasher
General System & Mechanical Integration
The wash cycle ends without performing the final spin phase.
Inspect Protocol
F4019Dishwasher
General System & Mechanical Integration
The cycle pauses before the last rinse, waiting for user action.
Inspect Protocol
F4020Dishwasher
Drainage System & Drain Pump
The program stops before the last rinse and does not carry out the final spin.
Inspect Protocol
F4021Dishwasher
General System & Mechanical Integration
The cycle, particularly the heating phase, is temporarily paused.
Inspect Protocol
F4022Dishwasher
Door Lock Mechanism & Safety Interlock
The dryer refuses to start and displays an alert regarding the filter door.
Inspect Protocol
F4023Dishwasher
Drainage System & Drain Pump
The drying program remains paused immediately after it is started.
Inspect Protocol
F4024Dishwasher
NTC Temperature Sensor & Thermistor
The device displays a temperature fault and the heating is inoperative or erratic.
Inspect Protocol
F4025Dishwasher
NTC Temperature Sensor & Thermistor
A temperature error is reported, with a risk of overheating or unregulated heating.
Inspect Protocol
F4026Dishwasher
General System & Mechanical Integration
After the program ends, the drum continues to rotate intermittently.
Inspect Protocol
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