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Before performing a software reset, inspect the following according to YYToner :
Dust or toner buildup on the "U-shaped" HP sensor can prevent it from detecting the actuator. sc569-00 ricoh
When this error appears, it typically points to a mechanical or electrical failure within the fuser unit's pressure release system. Before performing a software reset, inspect the following
Ensure all harnesses to the pressure release motor and sensors are firmly seated. YouTube·Copier Tech - MVP Quang Tình Before performing a software reset
Worn fuser films, damaged pressure rollers, or seized bearings can increase the physical load on the motor, causing it to stall.
The pressure release motor may be locked due to an excessive load, or the motor driver itself could be defective.