You need to :
- Check drain pump filter
- Check drain pump for blockage or restriction
- Check outlet hose for blockage or obstruction
- Check drain pump operation
- Check drain pump wiring
If there was no blockage in the hose, or you removed it, but you still receiving the E18 error code and the machine is not draining, the problem could be the pump. Take the filter out, put the machine on spin, and with the filter out, check to see if the pump impeller is rotating.
If the washing program is over and the impeller did not turn, it's possible that the pump is faulty.
If your machine is not under warranty, and you would like to replace the pump, just click on this link of the video explaining the procedure on
How to replace a Bosch Washing Machine Pump
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