Error code Description Action
121.07 Fuser has been on for more than allowed after a gap
blowout, and the temperature is still too cold.
1 Restore the engine settings to their defaults:
Diagnostics Menu > Printer Setup > Defaults
2 Restore the EP setup settings to their defaults:
Diagnostics Menu > EP Setup > Defaults
3 If the problem remains, go to “Fuser service
check” on page 91.
121.08 Fuser was under temp when page was in fuser.
121.20 Fuser undertemp during steady state control. Can
ocurr in printing or standby modes.
121.22 Fuser did not warm enough to start line voltage
detection.
121.23 Fuser took too long to heat to line detection temp.
121.24 Fuser never reached detection temperature.
121.25 After line voltage detection, control did not roll over
to steady state control in time.
121.26 Failed to reach temperature during warm up.
121.28 Failed to reach EP warm up temperature in time.
121.29 Fuser failed to reach pre‑heat temperature for motor
start during warm up.
121.30 Fuser failed to reach printing temperature by the time
a page reached the fuser.
121.31 Fuser is too hot. Global overtemp check.
121.32 Open fuser main thermistor.
121.33 Open fuser edge thermistor.
121.34 Open fuser backup roll thermistor.
121.35 Attempting to POR after receiving a 121.34.
121.36 Fuser did not heat to allow compression jog.
121.37 Fuser heated faster than allowed during line voltage
detection.
126.01 Line frequency outside operating range of device.
1 Check the power cord for continuity. Replace
if necessary.
2 Make sure the nominal voltage source is within
specification. See “Electrical specifications”
on page 279.
3 If the problem remains, go to “LVPS service
check” on page 92.
126.02 No line frequency detected.
4514-630, -635, -636
Diagnostic information
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