Hello, error E12 does not appear in the user manual, if E21 appears and refers to not draining in a certain time, unplug the machine, lower the hose to the floor and check that the water comes out with good flow, if you see it comes out Little clean the filter of the pump, if the filter is clean check the hose that is unobstructed, once empty reschedule a wash without clothes, the shortest, total is to test, see if it ends, comments, greetings.