Error f21 message on machine. Checked white filter as per video. Nothing in it. Machine still gives message. Suspect some hardware from pockets went through machine. What is my next move?

What machine? What appliance? At least the brand and model number,or a better description. Confirm washing machine please..

What machine? What appliance? At least the brand and model number,or a better description. Confirm washing machine please.

Reset machine. Unplug then plug it back in after a few minutes. Let us know what happened.

Reset machine. Unplug then plug it back in after a few minutes. Let us know what happened.

This is a washer? Google f21 error codes, all relate to the pump.