My Bosch front loading washer is flashing E:13 and won't open

From user manual:

Indicator light "rinse" is lit and display is flashing "E:13" with no water remaining in the drum.
For some reason drain pump is blocked.
Clean the water drainage pipe and/or drain hose.

Dado

The door is not locked properly.
Open and close the door again and press the "start reload" button (play and pause button). If necessary, open the washing machine door, remove some of the cothing items and then push the door closed again. You can also try switching the washing machine off and on again, setting the programme and then starting the programme.

use grease

These doors are usually on a timer and so won't be released for opening until a couple of minutes have passed by after turning the machine off.

Assuming you've already allowed for this, try giving the door a good firm push (closing) on the mechanism. It may just have caught partially closed.

sorry for the delay in getting back to you. you have a bad door latch mechanism on your washer that needs to be replaced.

If its showing a key symbol then the child lock is on.Press and hold the start/pause button in for several seconds and this should take the child lock off and start to work again.

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.

I have noticed on both bosch and another brand, that if the lights flash, the board is defective and needs to be re-programed or replaced.Not sure if you have someone who can reprogram the ic in your board where you reside.

USING NON BIOLOGICAL DETERGENTS AND LOW TEMP WASHES WILL EVENTUALLY LEAVE GUNK IN DRUM AND AROUND DOOR SEAL TRY USING BIO DETERGENT HOTTER COTTON WASHES AND THE OCCASIONAL 90 DEGREE WASH

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.