What does the code E12 mean on my Bosch Vision 300 washer

SOURCE: Bosch 500 washer won't finish rinse cycle. Flashing error code13

Timed out on drain cycle, basically you either have an outlet blockage or something is trapped in the pump, you can check the pump by opening the bottom right flap on the front panel,manually emptying the w/m and checking the pump filter for coins etc. Also, check the outlet isn't blocked.
Good Luck.

SOURCE: Bosch Error Code 13 Washer won't drain

First, unplug your washer. After that find the little round plate below your drum opening on the exterior of the washer. It should have a small hole in it. Use something to gently push trough this hole and twist the cover off, Inside there you will find the drain access. Be careful, if there is water in your drum this will make a mess when you unscrew the drain access. Take the usual precautions and unscrew the drain access slowly until it is off. Remove any obstructions and replace access door and cover. Clean up any mess and plug back in your washer and try again. takes about thirty minutes to an hour depending on how much water is in the drum.

SOURCE: Bosch Vision 300/500/dlx Series Clothes

Im getting an error e13 message and don't know what to do

SOURCE: front load washer Bosch Vision 300/500/DLX will not drain getting a code of E27 can you help. Can't find the code # in the booklet that came with it.

A code E27 means a problem with the door lock. Try unpluging the machine for an hour and see if it resets the lock.

If not remove the cover on the lower right corner you will see a white plastic pull cord. Pull the cord and pull open the door. If that doesn't reset the door lock you will need to replace the lock.