C-3421 = Fusing heaters trouble
To Reset:
1. Turn OFF the main power switch.
2. Turn main power switch ON while pressing the Utility/Counter key.
3. Touch [Trouble Reset].
4. Check to make sure that [OK] is displayed and the it has been reset.
5. After turning off the main power switch, turn it on again more than 10 seconds after and check if the machine starts correctly.
If error code returns a technician is needed to replace fuser section. Call local dealer with error code and tell them to make sure a tech brings a fuser assembly.
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