Bosch Washer Error Code 27

Error code 27 on a Bosch washer indicates a failure in the offset adjustment calibration of the analogue pressure sensor. This means the sensor that monitors water level inside the drum is producing a signal outside the expected range. The washer stops operation to prevent water level errors that could damage the machine or laundry. The pressure sensor itself or the wiring harness connecting it are the primary components to inspect.

A reset may temporarily clear the error display, but it will not fix the underlying fault with the pressure sensor or wiring. The code will return as soon as the washer attempts to calibrate the sensor at the start of the next cycle. A proper repair of the sensor or harness is required to permanently resolve the error.

If the issue is a loose or damaged wiring connection that you can address yourself, the cost may be minimal or zero. If the pressure sensor needs to be replaced, parts typically range from around $20 to $60 depending on the model, with professional labor adding $80 to $150 or more depending on your location. A full technician repair visit for this fault generally falls in the $100 to $200 range total.

Some causes of error 27 are DIY-friendly, such as reseating a loose connector on the wiring harness or clearing a kinked pressure hose. If those steps do not resolve the error, the pressure sensor itself likely needs to be replaced, which requires basic disassembly skills and comfort working around electrical components. If you are not confident handling those repairs, a qualified technician is the safer option.

It is not recommended to continue using the washer while error 27 is active. Because the pressure sensor controls water fill levels, a faulty sensor could allow the machine to overfill, underfill, or behave unpredictably during the wash cycle. Running the washer in this condition risks water damage and could stress other components.