All codes
Service call
SC545
Fusing lamp remains on
AFusingCommon field call
Level A — stop, SP reset after repair
First check
Stuck relay/triac or a thermistor that never reports heat.
What it means
Full-power heater on-time exceeded the limit. Sister of 543/544.
Likely causes
- Heater drive stuck
- Thermistor open
- Control
On-site steps
Parts to have on the truck
- Fusing unit
- PSU
- Thermistor
SP / reset
SP5-810-001
Related procedures
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.