How do I clear E4 error on my washing machine?

Hello there, I'm curious about something. I've been having some issues with my washing machine lately, specifically with an E4 error code popping up. Could you please shed some light on what this error code means and how I can go about clearing it? I've tried a few things like restarting the machine and checking the water supply, but so far, no luck. Any advice or guidance would be greatly appreciated. Thank you in advance!