Water, wash normally indicates the power section, a microprocessor (CPU) were normal. The drain valve failure should the control circuit part. In a state with a multimeter measured drainage IC1 {6} pin voltage is 0.8V normal (14021WFCS each foot voltages see table). V3 is then measured transistor conduction, VS3 conduction, AC220V added to the rectifier bridge ZD, ZD but no DC output. Thereby determining ZD rectifier bridge damage, resulting in a drain valve does not pull and can not drain.hZtservice manual download site