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new dishwasher shows E4 (brand Bosh)?

Hi there!
We ve got new dishwasher and after couple of cycles it started to show E4.
We needed help to install it so now im trying to understand if the guy who installed it did smth wrong and we should call him, or can we manage ourselves, or maybe its faulty appliance.
It star the cycle...washes the dishes and stops in about half an hour and basically do not dry them...
Please any advice would be helpful!
anna.savchenko, May 2014