Washing machine won't let water out

If it is a F18 error,t means that the pump out time is too long. Most likely clogged filter.
Open panel on the bottom right, drain the water out using the left hose and remove the filter plug. Have a look and clear obstructions.
That should help.

You can find a PDF copy here: Bosch Classixx 5 Manual

Sump hose has fallen off Unplug tilt machine back have a look underside to check also could be the soap dispenser hose Hole in it.This rubs away on side of machine 5yrs old.

This might help you with the pump its on a bosch Please remember to subscribe to our YouTube channel for all appliance tutorials
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I'm not an expert. I just had the same error (on a Bosch Maxx 6) and fixed it by chance.

My area has a lot of debris in the water supply, and it turns out that the small filter in the hose connected to the water supply was completely clogged up. You can either replace this filter, or clean it as outlined below.

Here are the steps to cleaning it:

1) Unplug washer
2) Turn of the water supply, either by a turning the handle to the washing machine water supply or by turning of the water main.
3) unscrew both ends of the water supply hose
4) Screw the washing machine end of the water hose into the water supply outlet
5) On the other end of the hose, there is a small filter. Hold this in place with the tip of your finger, and turn on the water supply for a few seconds, while keeping the free end of the hose in a bucket. This will flush water through the filter in reverse, thereby cleaning it. Do NOT reverse water flow with one end still attached to the washer machine, as this will flush all the debris into your machine!
6) Turn of the water supply, unscrew the water hose, and reconnect both ends as specified by the manufacturer.

Hope that helps!

-Dennis

I have the same problem - Did you mange to sort it out?

My old Bosch only had a filter in the machine (where the hose attaches. My Exxcel has a filter IN THE HOSE at the tap end too. I removed that one and it made a big difference !

NEED A USER INTRUCTION FOR BOSCH CLASSIXX5 AA600, MACINE IS ITALIAN AND i AM ENGLISH!!! - PLEASE HELP!!!

Bosch classixx 1200 express washing machine won't drain

cheak the filter witch is at the intake and if when it is going to fill does it buzz if dose that means the vale is working if not call a repaire man out hope this helps