Samsung ProXpress M456x Series Service Manual page 162

4. Troubleshooting
Error Code Error Message
U1-2343 Fuser Unit Failure: #U1-2343. Turn off then on. Call for service if the
problem persists
U1-234H Fuser Unit Failure: #U1-234H. Turn off then on. Call for service if the
problem persists
U2-1111 LSU Failure: #U2-1111.Turn off then on. Call for service if the problem
persists
U2-1112 LSU Failure: #U2-1112. Turn off then on. Call for service if the problem
persists
U2-1113 LSU Failure: #U2-1113.Turn off then on. Call for service if the problem
persists
U3-3313 Original paper jam inside the scanner
U3-3314 Original paper jam inside the scanner
U3-4210 Top door of scanner is open
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