Bosch Washer Error Code 29

Error code 29 on a Bosch washer indicates that the flow sensor has detected no water filling during a fast measurement cycle. The flow sensor monitors water entering the drum and communicates this data to the control board. When the sensor registers zero or insufficient flow within the expected time window, the machine halts and displays error 29 to prevent a dry drum cycle. This is a protective function, not a mechanical failure in itself, though it does point to a specific failure somewhere in the water supply or inlet system.

The most common triggers are external: a closed water tap, a kinked supply hose, or a clogged inlet filter screen. The inlet filter sits where the supply hose connects to the washer's inlet valve and collects mineral deposits and debris over time. Low household water pressure can also cause this error, particularly if pressure drops below the threshold the inlet solenoid valve requires to open fully. Beyond external supply issues, the solenoid valve itself may have failed electrically or mechanically, preventing water from entering regardless of supply pressure.

Internal components can also be responsible. The aqua stop valve, which is a safety shutoff built into the supply hose assembly, may have triggered or failed in the closed position. The pressure sensor, which confirms water level in the drum, can produce false readings if faulty, misleading the control board into thinking no fill occurred even when water is present. The wire harness connecting the flow sensor, pressure sensor, or solenoid valve to the control board should also be inspected for damaged, corroded, or disconnected terminals before replacing any components.