Bosch Washing Machine Error Code E28 — Flow Sensor Fault
What this means
Error E28 means the flow sensor, which measures how much water is entering the machine, is not working properly. This can be caused by mineral buildup on the sensor, faulty wiring, or a defective sensor. Without accurate flow readings, the washer cannot properly control fill levels.
Alternate codes: F28
Step-by-step fix
4 stepsPower cycle the washer
Unplug for 5 minutes and restart. Temporary sensor glitches may clear.
Clean the flow sensor
Locate the flow sensor near the water inlet valve. Remove and clean any mineral deposits.
Vinegar soaking for 15 minutes helps dissolve calcium buildup.
Check wiring
Inspect the sensor wiring harness for damage or loose connections.
Replace the flow sensor
If cleaning and checking wiring does not resolve the issue, replace the flow sensor.
When to call a professional
If the flow sensor replacement does not fix the issue, the control board may need diagnosis.
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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