That means that there is a leak that passed throught the waterproof system, and the water protection system had reacted putting the machine on error mode, as the water can damage electric parts, and cause serious hazard.
Sometimes you can reset the error by unplugging power cord, however you should call immediately a technician, as using the appliance when there is a problem with the waterproof system, you can be seriously injured by electric shock.
Operating instructions for Washing machine W 3923 WPS
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