Bosch Washer Error Code Er:21

Er:21 means the drain pump ran longer than the control board's programmed time limit without successfully draining the tub. The washer stops the cycle automatically to prevent damage. This code points to a problem in the drain system, which includes the pump, the drain hose, and the wire harness connecting the pump to the control board.

No, you should not continue running the washer until the fault is resolved. Er:21 indicates water is not draining properly, and running a cycle with standing water in the tub can stress the motor and other internal components. There is also a risk of water remaining in the drum and causing mold or mildew buildup.

Repair costs vary depending on the cause. Cleaning a clogged pump filter costs nothing beyond your time. Replacing a drain pump motor typically runs anywhere from $80 to $200 or more for parts alone, with labor adding to the total if a technician is involved. Wiring harness repairs generally fall in a similar range depending on the extent of the damage.

Many cases of Er:21 can be resolved without professional help. Start by cleaning the drain pump filter and checking the drain hose for kinks or blockages, as these are the most common causes. If those steps do not resolve the issue, testing or replacing the drain pump motor or inspecting the wire harness may require more technical skill and specialized tools.

Resetting the washer may temporarily clear the error code, but it will return if the underlying drainage problem is not corrected. To reset, you can power the machine off and back on or unplug it for a few minutes. The code will reappear on the next drain cycle if the clog, hose issue, or pump fault has not been addressed.