Bosch Washer Error Code F:27

F:27 indicates that the washer's control board failed to complete the offset calibration of the analog pressure sensor, which is the component responsible for measuring the water level inside the drum. The error means the sensor produced a signal the board could not use for calibration, so it skipped the adjustment and retained the last saved value. The code points to either a broken pressure sensor or a problem with the wiring harness connected to it.

Continuing to run the washer with an active F:27 code is not recommended. Because the machine is relying on an old stored calibration value rather than a live sensor reading, it may misjudge the water level and risk overfilling or not filling correctly. Running cycles under these conditions could lead to water leaks or poor wash performance, so the issue should be diagnosed before further use.

If the repair involves only reseating a connector or clearing a kinked hose, there may be no parts cost at all, though a service call from a technician would typically run in the range of $80 to $150 for labor. Replacing the analog pressure sensor itself generally costs between $20 and $60 for the part, with additional labor charges if a technician performs the work. A main control board replacement, if required, is significantly more expensive, often ranging from $150 to $350 or more for parts and labor combined.

Some causes of F:27 are accessible to a confident DIYer, such as reseating a loose connector, inspecting the wire harness for visible damage, or clearing a kinked pressure hose. If the sensor itself needs to be replaced, the repair requires disconnecting power, accessing the sensor inside the machine, and installing a compatible replacement part. Checking the wiring and hose first is always the recommended starting point before purchasing any components.

A reset may temporarily clear the F:27 display, but the error will return as soon as the machine attempts to calibrate the pressure sensor again at the start of the next cycle, assuming the underlying fault has not been fixed. Resetting is useful for confirming whether the problem is persistent, but it does not address the cause. The sensor and wiring need to be inspected and repaired or replaced to resolve the code permanently.