Thank you for asking your question on JustAnswer, Myself and the other Experts are anxious to help you, If I could please have the make and model number of the appliance that you have posted your question about? Along with any other info that you may think is important that you did not list in your original post to us. I will be more then happy to assist you.
what button is flashing ?
is it the clean button?
ok you will do a key dance,
press high temp wash ,sani rinse ,high temp wash , sani rinse
All th lights will go on ,let run for about 30 sec. then press cancel twice. clean light ,should be off
Also always run hot water at sink to make sure water entering dishwasher.
ok one more time press heated wash ,let go sani rinse let go then heated dry , let go then sani rinse , let go
All light should come on .
then you will need to call for service, if you can`t get it to reset .
Once in a while one won`t reset ,not to often but it does happen !!!