Water wont drain from diswasher - Frigidaire 24 in. PLD2850 Built-in Dishwasher

Probably the relay that switches the water flow between "recirculate/clean and exhaust" cycles. You can confirm by opening the bottom panel and looking at the relay arm. When switching from "washing" to emptying cycle, you will see the relay lever try to switch the flow of the water to the exhaust cycle. Alternately, remove the exhaust hose from the garbage disposal and place it in a bucket or bowl. After the water stops coming out, blow into the end of the hose to see if any food is blocking the hose (sometimes someone operates the disposal while the dishwasher is running and forces food into the exhaust hose.