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Error code reference

Miele Freezer Error Code 1-3-1

Icemaker

Miele codesMiele freezer codes

Icemaker: Icemaker sensor fault.

First step from the service manual

Switch appliance off and on. If fault code reappears, replace icemaker because sensor is not replaceable.

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

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What 1-3-1 means on a Miele freezer

Error code 1-3-1 on a Miele freezer indicates a fault with the icemaker sensor. This sensor is embedded within the icemaker assembly and is responsible for monitoring temperature conditions within the ice-making cycle. When the control board cannot receive a valid signal from this sensor, whether due to an open circuit, a short, or a failed sensing element, it flags the 1-3-1 fault and interrupts normal icemaker operation to prevent incorrect ice production or component damage.

The critical design detail with this fault is that the icemaker sensor is not a separately serviceable component. It is integrated directly into the icemaker unit itself. This means standard sensor-swap diagnostics do not apply here. Technicians cannot test or replace the sensor in isolation. If the fault persists after a power cycle, the entire icemaker assembly must be replaced as a single unit.

The recommended first step is to switch the appliance off and then back on. This reset clears any transient electrical glitches that could cause a false sensor fault reading. If the 1-3-1 code returns after the reset, the icemaker assembly has failed and replacement is required. Continuing to operate the freezer with this fault active will result in no ice production, though the freezer compartment itself should continue to maintain temperature normally.

Source: manufacturer service documentation.

Common causes of 1-3-1

  1. 01

    Failed integrated icemaker sensor

    Part replacement

    The temperature sensor built into the icemaker assembly has failed internally. Because it cannot be separated from the icemaker unit, a persistent 1-3-1 code after a power cycle confirms the icemaker assembly needs full replacement.

  2. 02

    Transient electrical glitch

    Wiring / connection

    A brief power fluctuation or voltage irregularity can cause the control board to lose communication with the sensor momentarily and trigger a false fault. Switching the appliance off and back on will clear this if no hardware failure is present.

  3. 03

    Wiring or connector fault between icemaker and control board

    Wiring / connection

    A loose, corroded, or damaged wiring harness connection between the icemaker assembly and the main control board can produce a sensor fault signal. Inspecting and reseating the icemaker connector may resolve the code before committing to a full replacement.

  4. 04

    Moisture or ice intrusion into icemaker assembly

    Part replacement

    Water infiltration into the icemaker housing can short or corrode the integrated sensor contacts. This type of damage is typically not recoverable and will require icemaker assembly replacement.

See the test procedure for each cause

Frequently asked questions about 1-3-1

What does 1-3-1 mean on a Miele freezer?
Error code 1-3-1 on a Miele freezer signals a fault with the sensor inside the icemaker unit. The sensor monitors conditions during the ice-making cycle, and when the control board cannot read a valid signal from it, this code is triggered. The icemaker will stop producing ice, but the freezer compartment should continue cooling normally. Because the sensor is integrated into the icemaker assembly, it cannot be replaced independently.
Will resetting my Miele freezer clear the 1-3-1 error code?
Switching the freezer off and back on is always the correct first step, as a transient electrical glitch can cause a false 1-3-1 fault that clears with a simple power cycle. If the code reappears after the reset, the icemaker assembly has a genuine hardware failure and the reset will not provide a lasting fix. In that case, the icemaker unit must be replaced.
Can I replace just the sensor to fix the 1-3-1 fault on my Miele freezer?
No. The icemaker sensor on Miele freezers displaying this code is integrated directly into the icemaker assembly and is not a separately replaceable component. The only supported repair when the fault persists after a power cycle is to replace the complete icemaker unit. Attempting to service the sensor individually is not a supported repair path.
Is it safe to keep using my Miele freezer while the 1-3-1 code is active?
The freezer compartment itself should continue to maintain its set temperature even with the 1-3-1 fault active. The risk is limited to the icemaker function, which will not operate correctly during this fault. It is generally safe to continue using the freezer for food storage, but ice production will be unavailable until the icemaker assembly is replaced.
How much does it cost to fix a 1-3-1 error on a Miele freezer?
Because the repair requires replacing the full icemaker assembly, costs will include both the part and labor. Icemaker assemblies for Miele appliances typically range from a few hundred dollars on the lower end depending on the specific model. Labor from a qualified technician will add to the total, so expect the full repair to fall somewhere between a moderate and significant service cost. Getting a quote from a Miele-authorized service provider before proceeding is recommended.

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