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Error code reference

Thermador Range Error Code Er:19

WFR 2460 washer

Thermador codesThermador range codes

WFR 2460 washer: Aqua stop fault (after 15 start-up attempts).

First step from the service manual

Eliminate leaks.

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
  • Wiring diagram references and connector pinouts from the OEM service manual
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What Er:19 means on a Thermador range

Er:19 on a Thermador range with the WFR 2460 washer indicates an Aqua Stop fault. The Aqua Stop system is a safety mechanism designed to detect water leaks and shut down water flow to prevent flooding or appliance damage. When the control detects a leak or abnormal water condition, it activates the Aqua Stop valve and halts normal operation. The Er:19 code specifically triggers after 15 consecutive failed start-up attempts, meaning the appliance has repeatedly tried and failed to clear the fault condition before locking out.

The Aqua Stop system works by monitoring a float switch or leak sensor typically located in the base tray of the unit. If water accumulates in this tray, the float rises and signals the control board to cut water supply and flag the fault. This can result from actual plumbing leaks, a failed inlet valve, a cracked or displaced hose, or a faulty Aqua Stop valve that is not releasing properly even when no leak is present.

Diagnosing Er:19 requires a thorough inspection of the entire water inlet path and the base of the appliance. The first and most critical step is to check for any visible water accumulation, dripping connections, or damaged hoses. If the base tray contains water, it must be dried out completely before the float switch will reset and normal operation can resume. If no leak source is found but the fault persists, the Aqua Stop valve assembly or the float switch sensor itself may be defective and require replacement.

Source: manufacturer service documentation.

Common causes of Er:19

  1. 01

    Water accumulation in the base tray

    Wiring / connection

    Water pooled in the bottom drip tray raises the float switch, triggering the Aqua Stop fault. Inspect the base of the unit and dry out any standing water before attempting a restart.

  2. 02

    Leaking water inlet hose or connection

    Part replacement

    A loose, cracked, or improperly seated inlet hose can allow water to drip into the base tray and activate the sensor. Check all hose connections at both the valve and the supply fitting for moisture or damage.

  3. 03

    Faulty Aqua Stop valve

    Part replacement

    The Aqua Stop valve assembly itself can fail mechanically or electrically, causing it to signal a fault even when no actual leak exists. If no water or leak source is found, the valve may need to be tested and replaced.

  4. 04

    Defective float switch or leak sensor

    Part replacement

    The float switch in the base tray can stick in the raised position or fail electrically, sending a continuous fault signal to the control board regardless of actual water presence.

  5. 05

    Failed water inlet valve

    Part replacement

    A water inlet valve that does not close fully can allow a slow drip into the appliance over time, eventually accumulating enough water to trigger the Aqua Stop system.

See the test procedure for each cause

Frequently asked questions about Er:19

What does Er:19 mean on a Thermador range?
Er:19 indicates an Aqua Stop fault on the WFR 2460 washer system. The Aqua Stop is a safety feature that detects water leaks and shuts down the appliance to prevent flooding. This code appears after 15 failed start-up attempts, meaning the appliance has been unable to clear the fault on its own. The first step is to inspect for any water leaks or accumulated water in the base tray.
Can I fix Er:19 on my Thermador appliance myself?
In some cases, yes. If the fault was caused by a minor leak or water splash that left water in the base tray, drying out the tray completely may allow the float switch to reset and clear the error. However, if an actual leak source exists, such as a cracked hose or failed valve, that component will need to be repaired or replaced, which may require a qualified technician.
Is it safe to use my Thermador appliance when Er:19 is displayed?
No, you should not attempt to operate the appliance while Er:19 is active. The Aqua Stop system has shut down water flow as a safety measure to prevent potential water damage. Continuing to force operation without identifying and correcting the leak source could result in flooding or further damage to the appliance.
Will resetting the appliance clear the Er:19 error code?
A simple power reset is unlikely to permanently clear Er:19 because the control has already cycled through 15 restart attempts before locking out. The underlying cause, whether it is standing water in the base tray, a leak, or a faulty component, must be addressed first. Once the root cause is resolved and the base tray is dry, the fault should clear on its own or after a reset.
How much does it cost to repair an Er:19 fault on a Thermador appliance?
Repair costs vary depending on the cause. If only the base tray needs to be dried and a hose connection tightened, the cost may be minimal. Replacing components such as the Aqua Stop valve assembly, inlet valve, or float switch typically costs between $150 and $450 including parts and labor, depending on part availability and local service rates.

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