this is what i found from the internet so not sure if this will be off help to you.
There could be several reasons why your Frigidaire washer will not agitate, including problems with the power supply, the wash cycle or the way in which the appliance was loaded.
It is a good idea to try to resolve the problem with your washer yourself first since unnecessary repair call-outs can potentially be expensive if your appliance is outside its warranty period. Troubleshooting your Frigidaire washing machine
will take about 15 minutes.
Confirm the water shutoff valves are open. If your Frigidaire washer cannot draw water from the pipes, it will not fill or agitate. The shutoff valves are usually located behind the washing machine where the water pipes meet the wall.
Allow the washing machine to cool down for 30 minutes. Frigidaire appliances automatically shut off if the motor starts to overheat. The cool-down period lasts for half an hour if the appliance has not been switched off manually.
Verify that the detergent draw is tightly closed. If the dispenser is left open, the washer will not start or agitate its load. Push the draw so it sits flush with the front of the washing machine.
Ensure that the washing machine door is closed. As with the detergent door, the appliance will not start if the door is left slightly open, to prevent water from spilling onto the floor. Push the door closed until it clicks, and try your load again.
Confirm that your Frigidaire dryer is set to a spin cycle. If your dryer is set to a soak cycle or is currently in the soak portion of a longer cycle, it will not spin or agitate the wash. Make sure the appliance is set to a spin load and try again.
Contact Frigidaire if problems continue. You may be entitled to free service if your washing machine is within its warranty period. See Resources for Frigidaire's contact information.
or read up more at this link.
Frigidaire washer won agitate Google Search
Top load washer tries to agitate, but seems ceased up. Will drain and spin fine.