How do I clear error code e04

It worked fine yesterday but this morning it had an error code. Any ideas?

์ด ์งˆ๋ฌธ์— ๋‹ตํ•˜๊ธฐ ์ €๋„ ๊ฐ™์€ ๋ฌธ์ œ๊ฐ€ ์žˆ์Šต๋‹ˆ๋‹ค

์ข‹์€ ์งˆ๋ฌธ์ž…๋‹ˆ๊นŒ?

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