Xerox: Fault Code 043-343

The thermistor is a temperature-sensing resistor that touches the fuser roller. If it becomes coated with toner, dust, or paper fibers, it sends inaccurate temperature readings to the control board. When the MCU detects a discrepancy between the expected temperature and the actual reading, it triggers code 043-343.

If you have service access (Hold 0 and Start while powering on to enter Diagnostic Mode), you can view additional sub-codes:

These granular codes help determine whether to replace the entire fuser assembly, a specific thermistor, or the drive assembly. Xerox Fault Code 043-343

Warning: The IMS operates at high temperatures (>100°C). Service should only be performed by qualified personnel.

While rarer, unstable power (brownouts, sagging voltage) can prevent the fuser lamps from drawing sufficient wattage. The machine logs this as a fuser temperature ramp-up failure. These granular codes help determine whether to replace

| Step | Action | |------|--------| | 1 | Device displays 043-343 and halts printing. | | 2 | User presses "More Info" → sees mismatch explanation. | | 3 | System offers "Auto-Fix" (safe NVM sync). | | 4 | If successful → device reboots IOT, clears fault, resumes jobs. | | 5 | If fails → prompts service number and saves diagnostic report. |

Xerox Fault Code 043-343 is a critical error message that typically appears on the control panels of mid-to-high-volume Xerox printers and multifunction devices (MFDs), particularly within the Color 550/560/570 series, the Versant 80/180 series, and the D95/D110/D125 production printers. While less common on desktop units, encountering this code generally indicates a hardware-level malfunction that halts all printing operations. a specific thermistor

If your machine has displayed this error, it is unlikely to resolve itself through simple rebooting. This comprehensive guide will explain exactly what code 043-343 means, what causes it, how to troubleshoot it, and when to call a certified technician.

If the error persists after the container is replaced: