The F33 codes indicates that the central control and drain pump have lost contact with each other.
The problem will be with the drain pump, central control or a loose wire connector.
You don't include many details but I would start by removing the lower access panel and check the connections on the drain pump. If you have access to a volt/ohm meter you can check resistance/continuity across the two terminals on the drain pump. An open circuit would indicate a bad pump.
You can try selecting a drain/spin cycle and see if the pump tries to run. If you have a meter and are comfortable using it you could try to check voltage to the drain pump. Use caution if you try this.
The imaging system is not working at this time so check your email for an image on how to access the drain pump.
I hope this information helps but submit another question with any additional details for further assistance.