Bosch Washer Error Code Er:20

Er:20 means the washer has detected an excessive amount of foam inside the drum. The machine triggers this code to prevent suds from damaging internal components like the drain pump or pressure sensor. It is almost always caused by using the wrong type of detergent or too much detergent. Reducing detergent or switching to an HE formula is the standard fix.

The washer pauses the cycle specifically to protect itself from foam-related damage, so you should not try to force the cycle to continue. Allow the machine to complete its foam-reduction process before opening the door or restarting. Continuing to use excessive detergent after repeated Er:20 errors could eventually cause damage to the drain pump or pressure sensor lines.

In most cases, Er:20 requires no paid repair at all since it is resolved by adjusting detergent type or quantity. If the error is caused by a faulty pressure sensor, professional diagnosis and part replacement could range from roughly 100 to 250 dollars depending on labor rates and parts availability in your area. Cleaning the dispenser drawer is a free maintenance step that can also help prevent recurrence.

Start by reducing the amount of detergent you use and confirm that it is labeled HE. If the error appeared mid-cycle, wait for the washer to finish any automatic extra rinse it may run, then drain and restart with less detergent. Cleaning the dispenser drawer to remove old residue is also recommended. If the error persists after correcting detergent use, a technician should inspect the pressure sensor.

Resetting the washer may clear the error temporarily, but it will return if the underlying detergent issue is not corrected. The washer may also clear the code on its own after running additional rinse cycles to reduce foam. A reset alone without changing detergent type or quantity is not a lasting solution.