Stack assist fan/Fr (FM2) rotation abnormality. Rotation abnormality that detected continuously for the specified time during the FM2 operation.
Measures to take when alert occurs:
- Stack assist fan/Fr (FM2)
- RU control board (RUCB)
- The message "Please call service" is displayed on the panel.
Solution:
- Check the connector connection and the wiring between RUCB and the fan, and repair it if any abnormality.
- Rotate the fan or I/O by hand, and repair it if any abnormality. (Wiring diagram: RU-510: 9-F, 3-B).
- Replace FM2.
- Replace RUCB.
