Bosch Washer Error Code 31

Error code 31 means the washer has detected that the water level in the drum has exceeded the overflow limit. The control board monitors water level through a pressure sensor and halts the cycle when that limit is reached. Common causes include a stuck inlet solenoid valve, a blocked pressure sensor hose, or a faulty pressure sensor. The machine stops itself automatically to prevent water damage.

You should not continue using the washer until the cause of code 31 is identified and corrected. An overflow condition can lead to water leaking onto the floor, which creates slip hazards and potential damage to surrounding cabinetry and flooring. The machine's automatic shutoff is a safety feature, and bypassing or ignoring it is not recommended.

Repair costs vary depending on which component has failed. If only the pressure sensor hose needs cleaning, there may be no parts cost and minimal labor. Replacing a water inlet solenoid valve typically costs between $40 and $120 for the part, while a pressure sensor replacement generally falls in the $30 to $90 range. Adding professional labor brings the total repair estimate to roughly $100 to $300 depending on your location and the technician's rates.

A reset may temporarily clear the code and allow the machine to restart, but if the underlying problem is not repaired, the error will return during the next fill cycle. If the solenoid valve is stuck open or the pressure sensor hose is blocked, these issues must be physically corrected before the washer will run normally. Always diagnose the root cause before relying on a reset.

Start by inspecting the pressure sensor hose for blockages or kinks, as this is a no-parts fix you can perform yourself. Next, check the water inlet solenoid valve to see if it is stuck open or failing electrically. Inspect the wire harness for damaged or loose connections. If the pressure sensor itself is faulty or miscalibrated, or if the solenoid valve needs replacement, those parts will need to be sourced and installed.