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F1 means there is water in the base pan under the bottom drawer. You need to pull the bottom drawer forward and there are 2 square push tabs just behind the front panel near the bottom on the right and left side. Push on these tabs and you can pull the drawer out further so that you can get behind the drawer and soak up the water in the base pan. When all the water out of the base pan, the F1 error will not return after you press cancel.