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Error code reference

Thermador Range Error Code Er:10

WFR 2460 washer

Thermador codesThermador range codes

WFR 2460 washer: Motor does not rotate (no/incorrect tachogenerator signal).

First step from the service manual

Start T/P 4 motor test programme.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What Er:10 means on a Thermador range

Er:10 on a Thermador range equipped with the WFR 2460 washer component indicates that the motor is failing to rotate, or is rotating without producing a valid tachogenerator signal. The tachogenerator (also called a tacho sensor or tach generator) is a small feedback device mounted on the motor shaft that sends a continuous pulse signal to the control board, reporting the motor's rotational speed. When the control board receives no signal, or receives a signal that falls outside the expected frequency or amplitude parameters, it interprets this as a motor rotation failure and triggers Er:10.

The root cause can originate in the motor itself, the tachogenerator, or the wiring between these components and the main control board. A seized motor or mechanical obstruction will prevent rotation entirely, producing no tacho signal at all. A worn or damaged tachogenerator coil can produce a weak or erratic signal even when the motor is physically turning, which also registers as an incorrect tachogenerator signal. Wiring harness issues such as broken conductors, corroded connectors, or loose terminals on the tacho circuit are also common contributors.

The recommended first diagnostic step is to run Test Programme 4 (T/P 4), the dedicated motor test routine. This programme drives the motor under controlled conditions and allows the technician to observe whether the motor responds and whether a valid tacho signal is generated. The results of T/P 4 will help isolate whether the fault lies in the motor assembly, the tachogenerator, or the control electronics.

Source: manufacturer service documentation.

Common causes of Er:10

  1. 01

    Faulty or worn tachogenerator

    Part replacement

    The tachogenerator coil can wear out or become damaged, producing a weak, absent, or erratic speed signal even when the motor itself is still turning. Resistance testing of the tacho coil leads can help confirm this failure.

  2. 02

    Wiring harness or connector fault on tacho circuit

    Wiring / connection

    Broken wires, corroded terminals, or a loose connector between the tachogenerator and the control board can interrupt the signal path. Visually inspect all connectors and perform continuity checks on the tacho leads.

  3. 03

    Seized or failed motor

    Part replacement

    If the motor windings have burned out or the motor is mechanically seized, it will not rotate at all, producing no tacho signal. Check for continuity across the motor windings and inspect for any signs of burning or obstruction.

  4. 04

    Mechanical obstruction preventing motor rotation

    Wiring / connection

    A foreign object or jammed mechanical component connected to the motor shaft can physically prevent rotation without the motor itself being defective. Inspect the motor and any attached components for binding or blockage.

  5. 05

    Control board failure

    Part replacement

    If the control board is unable to send the correct drive signal to the motor or cannot read the tacho input correctly, Er:10 can appear even with a healthy motor and sensor. This is typically diagnosed after ruling out all other causes through T/P 4 testing.

See the test procedure for each cause

Frequently asked questions about Er:10

What does Er:10 mean on a Thermador range?
Er:10 indicates that the WFR 2460 washer motor is not rotating, or that the tachogenerator sensor attached to the motor is not producing a valid speed signal. The tachogenerator provides feedback to the control board confirming that the motor is spinning at the correct speed. When this signal is absent or incorrect, the control board logs Er:10 and interrupts normal operation. A technician should run Test Programme 4 to begin diagnosing the fault.
Can I fix Er:10 on my Thermador range myself?
Some basic checks, such as inspecting wiring connectors for corrosion or loose terminals, can be performed by a knowledgeable DIYer. However, properly diagnosing this error requires running the built-in motor test programme (T/P 4) and performing electrical tests on the tachogenerator and motor windings, which require a multimeter and familiarity with appliance electronics. Replacing the motor or tachogenerator should only be done by a qualified technician to ensure safety and correct reassembly.
Will resetting the Thermador range clear the Er:10 error?
A power reset may temporarily clear the error code from the display, but it will not resolve the underlying fault. If the motor, tachogenerator, or wiring has a genuine defect, the error will return as soon as the affected function is used again. The fault must be properly diagnosed and repaired to prevent recurrence.
Is it safe to use my Thermador range while Er:10 is active?
It is not advisable to continue using the appliance while Er:10 is active. A motor that is not operating correctly can place additional stress on related components and may indicate an electrical fault. Continued use before the issue is repaired could lead to further damage or create a safety hazard.
How much does it cost to repair a Thermador range showing Er:10?
Repair costs vary depending on which component has failed. A wiring or connector repair is typically the least expensive option, often in the range of $75 to $200 including labor. Replacing a tachogenerator or motor assembly can run between $150 and $500 or more, depending on parts pricing and labor rates in your area. A control board replacement, if required, tends to be at the higher end of the cost range.

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