The Mars 5 Ultra doesn’t show a single fixed numeric error code list the way some FDM printers do. Elegoo documents specific fault categories instead, shared across its Mars 5 and Saturn 4 series wiki pages, plus a startup self-check that flags several of them automatically before a print even starts.
Check Elegoo’s own wiki for the exact category shown. Motor Abnormal, a touchscreen stuck at the Elegoo logo, and power-on or print-button failures are the documented fault families for this printer so far, each with its own separate troubleshooting page.
A Motor Abnormal message is most often cured resin on the Z-axis lead screw rather than a failed part. Clean the lead screw with a lint-free cloth first, then check that the motor’s connection cables are seated and tightened, and only treat it as a hardware failure if the motor still won’t turn after both checks.
A touchscreen stuck at the Elegoo logo generally calls for a firmware update through the touchscreen’s own OTA process first, since some boards need that update before the display initializes correctly; a motherboard replacement is the last resort if the update doesn’t clear it. For power-on failures, check the connection and power supply before assuming a component has failed.
For anything tied to a failed print rather than the printer itself, exposure timing, FEP condition or resin temperature, treat that as a resin-process problem to diagnose separately, not a hardware error code.
Most Motor Abnormal and touchscreen faults trace back to routine care rather than a failed part, so cleaning and a firmware update clear most of what’s documented so far. For faults tied to a specific failed print rather than the printer itself, see Fix Failed Resin Prints: Exposure, FEP and Wash-Cure Errors, and for how the Mars 5 Ultra compares to other detail-focused printers, see Best 3D Printer for Miniatures.
For the fuller, resin-printer-specific version of these shared self-test faults, see the Elegoo Saturn 4 Ultra Error Code Index, which documents the same mainboard and self-test logic on Elegoo’s Saturn-series machine.