Good Afternoon Delia Collins, thank you for your post!
Based off the information you have provided your Frigidaire dishwasher is flashing an "ER" error code on the panel. Typically, the "ER" stands for an error code sometimes to help clear out a false error code you can perform a reset on your dishwasher. In order to do that you would need to disconnect power from your dishwasher for approximately ten minutes.
If you continue to experience an issue with the error code I would recommend contacting a technician for proper repairs. The technician will be able to properly diagnosis your dishwasher and this will help you to avoid any unnecessary part purchases. Hopefully this is helpful. -Matt
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