Bosch · Washing Machine
Bosch Washing Machine E28 Error Code
Inlet flow meter not detecting water
What this error means
E28 (F28) means the inlet flow sensor did not register water passing during fill—the reed switch or turbine in the inlet path reported zero flow while valves were open. Related to E17 but specifically flags the flow meter circuit.
How E28 is detected
Bosch washing machine models lock the door or lid before energizing fill, heat, or high-speed spin. E28 means the latch switch never sent a "locked" signal to the main control, or the lock motor did not complete its travel. On Bosch WAT28400UC, Bosch WGG254AXUC, and similar variants, clothing caught in the gasket, a misaligned strike, or a failed latch assembly are the most common mechanical causes—not the board itself.
Inspect the door gasket perimeter and strike alignment before replacing the latch. Clogged inlet filter stopping flow before the meter is reported frequently on this code. After correcting mechanical issues, shut off water and clean both inlet mesh screens at the rear valves. If the latch clicks but E28 persists, the door lock switch or wiring harness to the control board likely needs testing with a multimeter.
Do not force the door open during an active cycle; wait for the lock to release when the board de-energizes the lock motor—usually two to three minutes after canceling power on most Bosch units.
Common causes
- Clogged inlet filter stopping flow before the meter
- Flow meter turbine stuck by mineral deposits
- Inlet valve opens but no household pressure at the tap
- Broken wire at the flow meter connector
Step-by-step fixes
- 1Shut off water and clean both inlet mesh screens at the rear valves
- 2Confirm full flow at the disconnected hose into a bucket for ten seconds
- 3Run a cold rinse and listen for initial fill before E28 appears
- 4Reset breaker thirty seconds if a glitch followed a brief power dip
When to call a technician
Confirmed strong flow at the hose with recurring E28 requires inlet assembly or flow meter replacement.
Affected models
- Bosch WAT28400UC
- Bosch WGG254AXUC
- Bosch WGB246AXUC
Prevention & maintenance
- Wipe the door gasket weekly and avoid overloading items against the seal—E28 often starts as a slow leak or latch misalignment.
- Record when E28 appears in the cycle and whether it clears after a 60-second power reset on your Bosch washing machine—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for E28; Bosch uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting E28; reversed plugs on pumps and valves cause immediate repeat faults.