Fanuc Alarm Code List For Series 16i/18i/21i
Alarm 0-999: Fanuc alarm, the alarm if above 1000 maker / machinist / machine tool builder.
Alarm 0-250: programs / settings.
Alarm 300 ~: Pulse Coder, servo, interface, cables.
Alarm 400 ~: SVM, Motor, cable, and mechanics.
Alarm 500 ~ : Over travel.
Alarm 7n01 - 99: Spindle motor problems, SPM, Cable, Mechanical, cutting weight.
Alarm 9n01 - 99: Same as above.
Alarm 900-975: the problem is on the motherboard. (CPU cards, Axis cards, SRAM, DRAM)