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Error code reference

Thermador Range Error Code Er:12

WFR 2460 washer

Thermador codesThermador range codes

WFR 2460 washer: Flow rate sensor detects low water level.

First step from the service manual

Check line. Replace sensor.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
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What Er:12 means on a Thermador range

The Er:12 error code on a Thermador range equipped with the WFR 2460 washer system indicates that the flow rate sensor has detected a low water level condition. This code is specific to the integrated water-related wash function of the range, not the cooking components. The flow rate sensor continuously monitors water moving through the system and triggers this fault when flow drops below the expected threshold, signaling that the system cannot maintain adequate water volume for proper operation.

The most common root cause is a restriction or failure in the water supply line feeding the WFR 2460 system. A kinked supply line, a partially closed shutoff valve, or sediment buildup in the inlet screen can all reduce flow to a level the sensor interprets as critically low. In some cases, the supply line may appear intact but have an internal blockage or collapse that restricts flow without obvious external damage.

If the supply line checks out as fully open and unobstructed, the flow rate sensor itself is the next suspect. Sensors can fail due to mineral scale accumulation, internal corrosion, or electrical degradation, causing them to report a low-flow condition even when water volume is adequate. The recommended diagnostic sequence is to inspect and clear the supply line first, then replace the sensor if the line is confirmed to be in good working order.

Source: manufacturer service documentation.

Common causes of Er:12

  1. 01

    Restricted or kinked supply line

    Wiring / connection

    The water supply line feeding the WFR 2460 system may be kinked, pinched, or partially blocked, reducing flow below the sensor threshold. Trace the full length of the supply line and check for any bends, compression points, or shutoff valves that are not fully open.

  2. 02

    Clogged inlet screen or filter

    Wiring / connection

    Sediment or mineral deposits can accumulate in the inlet screen where the supply line connects to the unit, restricting water flow. Inspect and clean the screen if debris is present.

  3. 03

    Failed flow rate sensor

    Part replacement

    The flow rate sensor can fail due to scale buildup, corrosion, or internal electrical failure, causing it to falsely report low water levels even when flow is adequate. If the supply line and inlet screen are confirmed clear, sensor replacement is the indicated next step.

  4. 04

    Inadequate water supply pressure

    Wiring / connection

    If household water pressure is too low, the sensor may detect insufficient flow through the system. Verify that the home water pressure at the connection point meets the range requirements.

  5. 05

    Faulty wiring or connector to the sensor

    Wiring / connection

    A loose or corroded electrical connector between the flow rate sensor and the control board can cause intermittent or persistent low-flow fault readings. Inspect the sensor wiring harness for damage or poor connections.

See the test procedure for each cause

Frequently asked questions about Er:12

What does Er:12 mean on a Thermador range?
Er:12 on a Thermador range indicates that the flow rate sensor in the WFR 2460 washer system has detected a low water level. The sensor monitors water moving through the system and triggers this fault when flow drops below an acceptable level. The first steps are to inspect the water supply line for restrictions and, if the line is clear, to replace the flow rate sensor.
Can I fix Er:12 on my Thermador range myself?
Some of the causes of Er:12 are DIY-friendly, such as checking for a kinked supply line, clearing a clogged inlet screen, or verifying that the water shutoff valve is fully open. If those checks do not resolve the fault, replacing the flow rate sensor is the next step, which requires comfort working with appliance components and water connections. If you are uncertain, a qualified technician should perform the repair.
Is it safe to use my Thermador range while Er:12 is displayed?
The Er:12 code relates to the water system of the range, not the cooking functions directly, but it is best to avoid using the appliance until the fault is diagnosed and corrected. Operating the water system in a low-flow condition could lead to further component damage. Address the issue before resuming normal use.
Will resetting my Thermador range clear the Er:12 error?
A power reset may temporarily clear the Er:12 display, but the code will return if the underlying issue with the water supply line or flow rate sensor has not been corrected. A reset alone is not a repair. Diagnose and fix the root cause before relying on a reset to clear the fault.
How much does it cost to repair Er:12 on a Thermador range?
If the fix is simply clearing a blocked supply line or fully opening a shutoff valve, the cost is minimal. If the flow rate sensor needs replacement, parts and labor combined typically range from around $150 to $400 or more depending on your location and whether a technician is needed. Getting a diagnostic visit quote from a certified Thermador service provider will give you a more accurate estimate for your situation.

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