frigidaire dishwasher not rinsing dishes

My dishwasher is agitating as normal in the wash cycle, but it only hums on the rinse cycle. It does have water sitting in the bottom when I open the door to check, but there is no swishing noise indicating that the dishes are being rinsed. Does anyone out there have any ideas abut this and what part may be in need of replacing? I appreciate any help with this issue. Thanks:o

I cannot find any info on the given model number, please check it.
http://www.appliancepartspros.com/modelnumber_locator.aspx

If this is a non USA model I probably will not be able tyo get any info.

Could be the drain pump is shot, if the unit has a separate drain pump.