First check
What paper was running? Edge thermistor connector, then fuser.
What it means
End / edge thermistor error. Small-paper runs (envelopes, A5) overheat the center and starve the edge — or the edge sensor is open.
Likely causes
- Edge thermistor
- Narrow media
- Fusing unit
On-site steps
Parts to have on the truck
- Edge thermistor
- Fusing unit
SP / reset
SP5-810-001
Related codes
Confirm the subcode and part number in the FSM for this serial. Raicoh is a field companion, not a replacement for the book.