AEG GHE613CB3c (Ikea Välgjord) dishwasher error 50

See the edits below the text for two more possible causes I’ve encountered with this machine, both causing the same error. This post was originally created on WordPress, where it received a number of useful comments. Until I’ve migrated comments from the Wordpress site, you can find the original post here. Introduction Our Ikea Välgjord dishwasher stopped working last night. When switched on, it would take a minute or so, then begin beeping (three times, then about two seconds of silence). When opened, the display showed error code 50, and the bottom LED blinked.