121 errors
121 error messages
Error code Description Action
121.00 The fuser failed to reach temperature during
warm‑up.
See
“Fuser service check” on page 144.
121.01 Attempting to heat the fuser, but the fuser is not
installed.
121.02 Attempting to power up the fuser while it is too
warm (belt: 50°C, lamp: 76°C) to execute
EWC/line voltage detection after a Wrong
Fuser Installed error had been previously
declared.
121.10 The fuser did not warm up enough to start
EWC/line voltage detection (belt: 60°C, lamp:
88°C) within time-out (belt: 10 seconds, lamp:90
seconds).
121.11 The fuser took too long to reach the final
EWC/line detection temperature (belt: 90°C,
lamp: 149°C).
121.12 The fuser never reached final EWC/line detection
temperature (belt: 90°C, lamp: 149°C).
121.13 The fuser heated too fast to the final EWC/line
detection temperature (belt: 90°C, lamp: 149°C).
121.20 The fuser high power trace heating rate from
165°C to 180°C exceeded the error threshold.
121.22 Open fuser relay detected.
121.28 The fuser failed to reach the EP warm‑up
temperature in time.
121.31 The fuser is too hot.
121.32 The fuser is too cold for too long while its power
is at 100%.
3400-48x
Diagnostics and troubleshooting
143