Bosch Washer Error Code 28

Error code 28 on a Bosch washer indicates a problem with the flow sensor, which measures the rate of water entering the machine. The control board has detected that the sensor is returning implausible values or no signal at all. This causes the washer to stop operation to prevent incorrect water fill levels. The fault points to either a broken flow sensor or a problem with the wiring connected to it.

It is not recommended to continue running the washer while error code 28 is active. Without accurate flow sensor data, the machine cannot properly regulate water intake, which could result in underfilling or overfilling the drum. Overfilling in particular can lead to water leaks or damage to other components. Addressing the fault before resuming normal use is the safest approach.

Resetting the washer by unplugging it for a few minutes may temporarily clear the error code, but it will return as soon as the machine attempts a fill cycle and the flow sensor produces implausible data again. A reset does not address the underlying hardware fault. Permanent resolution requires inspecting and repairing or replacing the flow sensor or its wiring.

Some causes of error code 28 are DIY-friendly, such as reseating a loose connector, cleaning debris from the sensor housing, or inspecting the wire harness for visible damage. If the sensor itself has failed electrically, replacing it requires accessing internal components and a moderate level of comfort with appliance repair. If you are not confident working inside the machine, a qualified technician can handle the diagnosis and repair.

If the repair only involves cleaning the sensor or reseating a connector, costs are minimal and may only involve your time. A replacement flow sensor part typically falls in the range of $20 to $60 depending on the model. If professional labor is required for diagnosis and replacement, expect total repair costs in the range of $100 to $250, depending on your location and the technician's rates.