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Error code reference

Thermador Range Error Code 03

WFK 2401 washer

Thermador codesThermador range codes

WFK 2401 washer: No draining.

First step from the service manual

Disconnect drain pump and measure resistance at connector (~83 ohms). Replace drain pump if faulty.

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

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What 03 means on a Thermador range

Error code 03 on the Thermador WFK 2401 indicates a failure to drain. This fault is triggered when the control board does not detect successful water evacuation within the expected time window during a drain cycle. The drain pump is the primary component responsible for expelling water from the tub, and when this pump fails electrically or mechanically, the unit cannot complete its cycle and halts with this code.

The first diagnostic step targets the drain pump directly. Disconnecting the pump from its wiring harness and measuring resistance across the connector terminals should yield approximately 83 ohms. A reading significantly above or below this value indicates a failed pump motor winding. An open circuit or a shorted winding are both grounds for pump replacement. If resistance is within spec, the fault may lie in the wiring harness, connector integrity, or the control board itself.

Beyond electrical failure, drain pump problems can also be caused by mechanical blockages. Foreign objects such as coins, debris, or lint can jam the pump impeller, preventing it from spinning even if the motor winding tests within normal resistance range. Always inspect the pump filter and impeller for obstructions before condemning the pump electrically. Confirm the drain hose is not kinked or clogged, as a restriction downstream can also prevent proper drainage and trigger this code.

Source: manufacturer service documentation.

Common causes of 03

  1. 01

    Failed drain pump motor

    Part replacement

    The drain pump motor winding has failed, producing a resistance reading outside the expected range of approximately 83 ohms. This is the most common cause and requires replacing the drain pump assembly.

  2. 02

    Blocked pump impeller

    Wiring / connection

    A foreign object such as a coin, button, or debris has lodged in the pump impeller, preventing it from spinning. The pump may test electrically normal but cannot move water mechanically.

  3. 03

    Clogged or kinked drain hose

    Wiring / connection

    A restriction in the drain hose prevents water from exiting the unit even if the pump is functioning correctly. Inspect the full length of the drain hose for kinks, blockages, or improper installation height.

  4. 04

    Damaged wiring harness or connector

    Wiring / connection

    Corrosion, a broken wire, or a loose connector between the control board and the drain pump can interrupt the signal or power supply to the pump. Inspect the connector at the pump for signs of burn marks or corrosion.

  5. 05

    Faulty control board

    Part replacement

    If the pump and wiring test correctly and no blockage is present, the control board may not be sending the proper output to activate the drain pump. This is the least common cause and should only be diagnosed after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about 03

What does 03 mean on a Thermador range?
Error code 03 on a Thermador WFK 2401 indicates a no-drain fault. The appliance attempted to pump water out of the tub during a cycle but could not complete the process. The machine stops and displays this code to prevent further operation until the drain issue is resolved.
How do I fix error code 03 on my Thermador WFK 2401?
Start by disconnecting the drain pump connector and measuring the resistance across its terminals. The reading should be close to 83 ohms. If the resistance is outside that range, replace the drain pump. If resistance is normal, check for blockages in the pump filter, impeller, and drain hose before investigating the wiring harness and control board.
Is it safe to use my Thermador washer while error code 03 is active?
No, you should not continue running the washer while this code is active. The machine cannot drain water properly, which means the tub may remain filled with water. Continued use could lead to overflow, water damage, or additional stress on internal components.
How much does it cost to repair error code 03 on a Thermador washer?
If the repair requires only clearing a blockage from the pump filter or drain hose, the cost is minimal and may involve no parts at all. If the drain pump motor needs to be replaced, parts and labor costs typically range from around 150 to 350 dollars depending on your location and service provider. Control board replacement, if needed, will be on the higher end of repair costs.
Will resetting the Thermador WFK 2401 clear error code 03?
A reset may temporarily clear the code, but it will return as soon as the machine attempts another drain cycle if the underlying problem has not been fixed. The fault is condition-based, meaning the control board will detect the drain failure again and re-display the code. The root cause must be corrected to permanently resolve the error.

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