Bosch Gives an F21 Error – But the Engine Is Running: A Hidden Problem with the Tachogenerator and How to Detect It

When a Bosch washing machine displays the F21 error code, it’s generally interpreted as a motor-related fault—often pointing toward issues such as a blocked drum, worn-out brushes, or faulty control board. But what if the motor is running, the drum spins as expected, yet the F21 error persists? This situation is more common than many […]

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