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OEM VERIFIED BENCH
OFFICIAL FAULT CODEF191
Miele
Miele // OFFICIAL DIAGNOSTIC BENCH

Miele F191

Washing MachineNTC Temperature Sensor & Thermistor
Luxury front-loading washing machine in brushed titanium with illuminated dark glass drum
Washing Machine
Select Appliance Type
0ms Instant Telemetry Switch

Symptom / Description

FAULT

Specific cooking functions do not work properly and temperature regulation appears to be faulty.

TELEMETRY // LIVESIG: FAULT_DETECTED

Root Cause

ROOT CAUSE

The PT1000 temperature probe which is integrated into the heat flow sensor is short-circuited, providing erroneous information to the electronic card.

CIRCUIT // SUBSYSTEMLOGIC: ROOT_ISOLATED

Repair Instructions

UNLOCKED
1Turn off the device. Locate the heat flux sensor in the cavity. Inspect its wiring. Test the resistance of the PT1000 probe; a value close to zero ohm confirms the short circuit and the need to replace the entire sensor.
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.

CALIBRATED BENCH PROTOCOL // CAT III 600V

Workshop Verification & Safety Checklist

WORKSHOP VERIFICATION PROTOCOLNTC Temperature Sensor & ThermistorWashing Machine
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)
4.8kΩ–12kΩ (at 20°C–25°C)NOMINAL
0 Ω (SHORT)CALIBRATED BAND∞ OL (OPEN)
▲ NOMINAL OPERATING WINDOW
Target Component:NTC Temperature Sensor Probe (Thermistor)
Test Pins & Connections
PROBE (+)
PROBE (-)
Across sensor pins 1-2 (unplugged harness)
Tolerance & Diagnostic CriteriaNegative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit.
1. Pre-Intervention Electrical Safety Protocols
  • !Electrical Safety Protocol: Disconnect 230V electrical mains power before removing appliance side or rear panels.
  • !Ensure tub water or heating chamber has cooled below 30°C before unclipping thermistor probe.
  • !Use CAT III 600V/1000V insulated test probes when tng at PCB edge connectors.
3. Preliminary Mechanical & Visual Checks
  • Inspect sensor immersion sleeve for calcification, limescale scale, or thermal paste degradation.
  • Check wiring harness for pinch points, chafing against chassis metal, and terminal pin oxidation.
  • Verify probe is firmly seated in its rubber grommet or bracket inside the water/air circuit.
Perform these diagnostic steps before triggering AI Deep Search or replacing boards.Certified Workshop Routine

Frequently Asked Questions: Miele F191

FAQ TREE
What does error code F191 mean on a Miele appliance?

Miele error code F191 indicates: Specific cooking functions do not work properly and temperature regulation appears to be faulty..

What is the root cause of Miele error code F191?

The primary root cause for Miele code F191 is: The PT1000 temperature probe which is integrated into the heat flow sensor is short-circuited, providing erroneous information to the electronic card..

How do I fix or resolve Miele error code F191?

To resolve error code F191: Turn off the device. Locate the heat flux sensor in the cavity. Inspect its wiring. Test the resistance of the PT1000 probe; a value close to zero ohm confirms the short circuit and the need to replace the entire sensor.

Is it safe to clear Miele error code F191 by resetting power?

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Miele code F191 persists, the physical component causing The PT1000 temperature probe which is integrated into the heat flow sensor is short-circuited, providing erroneous information to the electronic card. must be inspected or replaced.

How do I test electrical resistance for Miele code F191 using a multimeter?

Set a digital multimeter to ohms (Ω). Disconnect power and test NTC Temperature Sensor Probe (Thermistor) across Across sensor pins 1-2 (unplugged harness). Expected nominal reading is 4.8kΩ–12kΩ (at 20°C–25°C). Tolerance: Negative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit..

What safety protocol must be followed before servicing Miele code F191?

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.

Community Verification

COMMUNITY

Did this solution resolve the issue?

SEMANTIC KNOWLEDGE GRAPH // MIELE

Related Miele Washing Machine Error Codes

Diagnostic Link Mesh14 OEM Cross-References

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

F192NTC Temperature Sensor & Thermistor
The oven displays incorrect temperature readings or does not heat, especially with advanced ...
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F193NTC Temperature Sensor & Thermistor
Cooking from the bottom is ineffective or excessive, as the oven is unable to regulate the h...
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F194NTC Temperature Sensor & Thermistor
The bottom heat is weak or non-existent, resulting in uneven cooking of dishes (undercooked ...
Inspect Protocol
F195Electronic Control Board (PCB) & Bus Communications
The wireless cooking probe does not transmit temperature information to the oven, making thi...
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F196Water Level Pressure Switch & Air Dome
The appliance (steam oven or dishwasher) stops during the cycle and reports an anomaly linke...
Inspect Protocol
F197General System & Mechanical Integration
The device displays error code F197, which is not listed in the user manual.
Inspect Protocol
F198General System & Mechanical Integration
An F198 code appears on the device's screen, preventing it from functioning normally.
Inspect Protocol
F199General System & Mechanical Integration
The operation of the device is interrupted by the display of error code F199.
Inspect Protocol
F20Heating Element, Thermostat & Safety Fuse
Miele F20: Water/air heating failure in Washing Machine; heating circuit does not reach set ...
Inspect Protocol
F200NTC Temperature Sensor & Thermistor
The cooling system (e.g. milk cooler) no longer produces cold or works non-stop.
Inspect Protocol
F201NTC Temperature Sensor & Thermistor
Cooling is completely inactive because the device does not receive any temperature informati...
Inspect Protocol
F202NTC Temperature Sensor & Thermistor
Cooling is poor and the heat extraction fan operates abnormally (continuously or never).
Inspect Protocol
F203NTC Temperature Sensor & Thermistor
The device no longer cools efficiently and can go into safety mode to avoid undetected overh...
Inspect Protocol
F204Electronic Control Board (PCB) & Bus Communications
The milk cooler of the coffee machine does not work, the milk remains at room temperature.
Inspect Protocol
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