What does error code U1-2320, U1-2330, or U1-2340 mean and how do I fix it?
These error codes indicate a Fuser Unit Failure. The recommended action shown in the error message is to turn the machine off and then back on. These fuser errors are caused by temperature control issues such as Open Heat Error, Low Heat Error, or Over Heat Error in the fuser unit. (Pages 70, 73)
From the official HP Samsung Xpress SL M2021 Laser Printer Series manual, page 70
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