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Error code reference

Thermador Range Error Code 01

WFK 2401 washer

Thermador codesThermador range codes

WFK 2401 washer: No water filling.

First step from the service manual

Turn on supply. Check water inlet hose filters. Check incoming water pressure 14.5-145 psi.

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

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What 01 means on a Thermador range

Error code 01 on the Thermador WFK 2401 indicates a water filling failure. The control board triggers this fault when it detects that the appliance has not received an adequate supply of water within the expected fill time. This is fundamentally a water inlet system fault, meaning the issue originates somewhere between the household water supply and the point where water enters the unit.

The most likely causes involve external supply conditions rather than internal component failure. The water supply valve may be closed or only partially open, the inlet hose may be kinked or blocked, or the mesh filters located at the inlet hose connection points may be clogged with sediment or mineral deposits. Incoming water pressure must fall within the operating range of 14.5 to 145 psi. Pressure below 14.5 psi will prevent the water inlet valve from opening fully or at all, triggering this fault even when the supply itself appears to be on.

If external supply conditions check out correctly, the fault may point to a failed water inlet valve solenoid, which controls the flow of water into the appliance. A faulty inlet valve will not open on command from the control board, resulting in the same no-fill condition. Wiring and connections between the control board and the inlet valve should also be inspected for corrosion or damage before replacing components.

Source: manufacturer service documentation.

Common causes of 01

  1. 01

    Water supply valve closed or partially open

    Wiring / connection

    The shutoff valve behind or beneath the unit may be fully or partially closed, preventing water from reaching the appliance. Open the valve completely and check for water flow.

  2. 02

    Clogged water inlet hose filters

    Wiring / connection

    Mesh screens located at the inlet hose connection points trap sediment and mineral debris over time. Remove the hose and inspect the filters, rinsing or replacing them if they appear blocked.

  3. 03

    Inadequate incoming water pressure

    Wiring / connection

    Water pressure below 14.5 psi will prevent the inlet valve from opening properly. Verify household pressure is within the required 14.5 to 145 psi range using a pressure gauge at the supply connection.

  4. 04

    Kinked or blocked inlet hose

    Part replacement

    A bent or kinked water inlet hose restricts flow and can cause a no-fill condition even when supply pressure is adequate. Inspect the hose along its full length and straighten or replace it as needed.

  5. 05

    Failed water inlet valve

    Part replacement

    If all external supply conditions are confirmed correct, the internal solenoid-operated water inlet valve may have failed and is not opening when commanded by the control board. This component requires replacement.

See the test procedure for each cause

Frequently asked questions about 01

What does 01 mean on a Thermador range?
Error code 01 on the Thermador WFK 2401 indicates a water filling failure. The appliance attempted to fill with water but did not detect sufficient water entering within the expected timeframe. This fault points to an issue in the water supply system, including the supply valve, inlet hose, filters, or the inlet valve itself.
How do I fix error code 01 on my Thermador appliance?
Start by confirming the water supply valve is fully open and that household water pressure is between 14.5 and 145 psi. Next, disconnect the inlet hose and check the mesh filter screens at the connection point for sediment or mineral buildup, rinsing them clean if needed. If the supply and filters check out, inspect the inlet hose for kinks. If the fault persists after all external checks, the water inlet valve solenoid may need to be tested and replaced.
Is error code 01 on a Thermador appliance a safety concern?
Error code 01 is not a safety hazard in itself. It simply means the appliance stopped its cycle because it could not fill with water. The unit will not operate in this condition, which prevents it from running without adequate water supply. Address the underlying cause before resuming use.
Will resetting my Thermador appliance clear error code 01?
A reset may temporarily clear the error code display, but the fault will return immediately if the root cause has not been resolved. The appliance will attempt to fill again and trigger code 01 as soon as it detects the same no-fill condition. Always address the water supply issue first before attempting a reset.
How much does it cost to repair error code 01 on a Thermador appliance?
If the fix involves simply opening a supply valve or cleaning the inlet hose filters, there is no parts cost involved. Replacing a water inlet hose typically costs in the range of $15 to $40 for the part. If the internal water inlet valve has failed, parts and labor combined can range from $100 to $300 depending on the specific valve and your location.

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