buy Finish dishwasher cleaning kit from the super market and follow the instructions on how to use it. The cleaning kit should be run with empty dishwasher.
THis should help clean the pump and drain hose.
It would help if you mention the model number of your dishwasher. It is hard to get an english manual for Teka.
I tried this site
http://instructionsmanuals.com/lista2-20-49-en-Dishwashers-Teka.htm
but they all seem to be in European languages.
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