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Error code reference

Miele Oven Error Code F191

Heat-flow Pt1000 temperature sensor (2R30-10) or wiring harness short-circuited.

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Heat-flow Pt1000 temperature sensor (2R30-10) or wiring harness short-circuited.

First step from the service manual

Check the wiring harness.

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

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What F191 means on a Miele oven

Error code F191 on a Miele oven indicates a short circuit condition in the heat-flow Pt1000 temperature sensor (component designation 2R30-10) or in the wiring harness connected to it. The Pt1000 is a precision resistance temperature detector that changes its electrical resistance in a predictable, linear manner as temperature increases, with a nominal resistance of 1000 ohms at 0 degrees Celsius. The oven's control board continuously monitors this resistance to accurately track internal heat flow and regulate cooking temperatures. When the resistance reading drops abnormally low due to a short circuit, the control board interprets this as a fault and triggers F191 to prevent unsafe or inaccurate operation.

A short circuit in this context means that two conductors in the sensor circuit are making unintended electrical contact, pulling the measured resistance toward zero and sending the control board an impossible temperature signal. This can occur within the sensor body itself if internal insulation has degraded due to prolonged heat exposure, or it can occur anywhere along the wiring harness routing between the sensor and the control board. Damaged insulation, pinched wires, moisture intrusion, or a connector that has corroded or partially melted can all create a short circuit path.

Diagnosing F191 begins with a thorough inspection of the wiring harness connected to the 2R30-10 sensor. Technicians should check for visible wire damage, melted insulation, and loose or corroded connector pins before testing the sensor resistance directly with a multimeter. A healthy Pt1000 sensor will read approximately 1000 ohms at room temperature. A reading near zero or a dead short confirms sensor failure, while normal sensor resistance points to a wiring harness fault.

Source: manufacturer service documentation.

Common causes of F191

  1. 01

    Damaged wiring harness insulation

    Part replacement

    Heat exposure over time can cause the plastic insulation on wires near the oven cavity to crack, melt, or become brittle, allowing bare conductors to contact each other or the oven chassis. Inspect the full length of the harness for any discoloration, melted sections, or exposed copper.

  2. 02

    Failed Pt1000 temperature sensor (2R30-10)

    Part replacement

    The sensor itself can develop an internal short when its internal insulation degrades after repeated heating and cooling cycles. Confirm this by disconnecting the sensor from the harness and measuring its resistance with a multimeter. A reading close to zero ohms indicates an internal short and requires sensor replacement.

  3. 03

    Corroded or damaged connector

    Part replacement

    The connectors joining the sensor wiring harness to the control board or to the sensor itself can corrode, arc, or partially melt, creating a conductive path that mimics a short circuit. Check all connector pins and housings for discoloration, pitting, or carbon tracking.

  4. 04

    Pinched or crimped wire

    Part replacement

    During prior service or through normal vibration over time, a wire in the harness can become pinched against a metal panel edge, wearing through the insulation and causing a short to ground. Trace the harness routing carefully, paying attention to grommets and any areas where wires pass through sheet metal.

  5. 05

    Moisture intrusion into the sensor circuit

    Wiring / connection

    Steam or cleaning liquid entering a connector or sensor housing can create a temporary conductive path that triggers a short circuit fault. After drying the affected area completely, retest the circuit to determine if the fault clears or if permanent damage has occurred.

See the test procedure for each cause

Frequently asked questions about F191

What does F191 mean on a Miele oven?
F191 indicates a short circuit detected in the heat-flow Pt1000 temperature sensor, component designation 2R30-10, or in the wiring harness connected to it. The Pt1000 sensor monitors heat flow inside the oven cavity and its resistance is read continuously by the control board. A short circuit drives the resistance reading abnormally low, making accurate temperature control impossible, so the oven triggers this fault code to halt normal operation.
Can I fix F191 on my Miele oven myself?
A knowledgeable DIYer comfortable with electrical testing can inspect the wiring harness for visible damage and test the Pt1000 sensor resistance using a multimeter. If the sensor reads close to zero ohms when disconnected, the sensor needs replacement. However, if the wiring harness is routed through areas that are difficult to access or if the control board connections need inspection, professional service is advisable to avoid further damage.
Is it safe to use my Miele oven while F191 is displayed?
It is not recommended to operate the oven while F191 is active. The fault indicates the heat-flow temperature sensor circuit is short-circuited, meaning the oven cannot accurately monitor or regulate its internal temperature. Continued use risks overheating, potential damage to other components, and unsafe cooking conditions.
How much does it cost to repair a Miele oven F191 error?
Repair costs depend on what has failed. Replacing the Pt1000 sensor typically falls in the range of 50 to 150 dollars for the part alone, while professional labor adds to that total. If the wiring harness requires replacement or repair, costs may range from 100 to 300 dollars or more depending on the extent of the damage and regional labor rates.
Will resetting my Miele oven clear the F191 error code?
A power reset may temporarily clear the F191 code from the display, but the fault will return as soon as the oven attempts to read the sensor again if the underlying short circuit has not been repaired. The short circuit in the sensor or wiring harness is a hardware fault that cannot be resolved through resetting alone. The defective component or wiring must be diagnosed and corrected to permanently clear the code.

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