All codes
Service call
SC551
Pressure roller thermistor open
AFusing
Level A — stop, SP reset after repair
First check
Pressure-side thermistor connector, then fusing unit.
What it means
Pressure-roller thermistor open / below range. Same family as 541, other side of the nip.
Likely causes
- Thermistor open
- Connector
- Fusing unit
On-site steps
Parts to have on the truck
- Pressure 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.