Bosch Vision 300 (Error Code E.01, Test Code C.06)

Hi Travis,

On Bosch washers, an E01 very often points to a door locking/door closed issue, but if a new interlock hasn’t cured it then the fault may be with the door itself, wiring, or the control board not seeing the lock signal properly.

Before checking anything internal, isolate the washing machine from the mains.

1. Check the door catch and hinges Make sure the door closes squarely and firmly. If the hinge is slightly dropped or the plastic door striker is worn/cracked, the new lock may not engage fully even though it looks shut.

2. Inspect the lock wiring more closely Don’t just check that plugs are fitted tightly. Look for broken conductors, overheated terminals, damaged insulation, or corrosion at the door lock plug and where the loom flexes. A continuity test on the harness back to the control can be worthwhile.

3. Check for a poor connection at the main PCB If the wiring and lock are sound, the control board may not be supplying or reading the lock circuit correctly. Look for signs of burning, a loose connector, or dry solder joints on the board.

4. Consider whether C06 is related or just a test-stage result I wouldn’t want to guess at that code without Bosch service data for your exact model. If the machine stops at the point it should lock the door, that still keeps the focus on the lock circuit/control side.

5. Double-check the replacement part Make sure the new latch/interlock is the exact correct part for WFVC4400 UC/24. Pattern parts or similar-looking versions can cause this sort of issue.

If the door alignment, wiring and correct lock all check out, the main control board becomes the most likely suspect. For mains testing or board diagnosis, it’s best to use a qualified appliance engineer.

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