whirpool adg 7555 - 6 flashes

Just installed new dishwasher, but it fails to start any program. Greenlight led is flashing 6 times. what does it mean?

do a search you will find the answer there ,left hand side panel off................

Thanks for response. I tried to reconnect all pipes and plug them again - now it works somehow at least water is coming in/out. Another problem I observe : any program i select runs only for 2-3 minutes, after it finishes - greenlight led is turned off - of course my things inside are still very dirty. what is the normal duration for programs ? i use 4in1 calgonit tablets. and i see "S" led is on all the time, what is it about?
thanks in advance