I have a Zanussi ZWG1140M that developed the E30 alarm and would not work. This means the door is not closed and locked. The problem was that the door was locked, so there was a prolem with thfeedback to the control. I checked the lock, and the switch gave a closed contact feed when the lock was operated. I then checked the orange feed wire to tge pcb, it was not damaged/broken. Then I checked d the pcb. There
was a corroded track. I soldered on a link wire to bridge the damaged area and it now works, error code gone, machine working cost is zero.
Martin Hook, September 2017