This document lists alarm codes for a Fanuc 21-T CNC control. It contains 50 alarm codes ranging from code 0 to code 50 with descriptions of what each code indicates, such as illegal axis commands, invalid G-codes, radius or offset value errors, and interference errors. The alarm codes cover issues that can occur with circular, thread, and fixed cycle blocks as well as invalid plane or radius specifications. The list is applicable to both the M and T series of Fanuc 21 controls.

1. Fanuc 21 alarmcodes complete list. (Fanuc 21 Model B)
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Fanuc Series 21-T CNC Control
Fanuc 21 Alarm Codes
 0 PLEASE TURN OFF POWER
 1 TH PARITY ALARM
 2 TV PARITY ALARM
 3 TOO MANY DIGITS
 4 ADDRESS NOT FOUND
 5 NO DATA AFTER ADDRESS

2.  6 ILLEGAL USE OF NEGATIVE SIGN
 7 ILLEGAL USE OF DECIMAL POINT
 9 ILLEGAL ADDRESS INPUT
 10 IMPROPER G–CODE
 11 NO FEEDRATE COMMANDED
 14 CAN NOT COMMAND G95 (M series)
 14 ILLEGAL LEAD COMMAND (T series)
 15 TOO MANY AXES COMMANDED (M series)

3.  15 TOO MANY AXES COMMANDED (T series)
 20 OVER TOLERANCE OF RADIUS
 21 ILLEGAL PLANE AXIS COMMANDED
 22 NO CIRCLE RADIUS
 23 ILLEGAL RADIUS COMMAND (T series)
 25 CANNOT COMMAND F0 IN G02/G03 (M series)
 27 NO AXES COMMANDED IN G43/G44 (M series)
 28 ILLEGAL PLANE SELECT
 29 ILLEGAL OFFSET VALUE (M series)
 29 ILLEGAL OFFSET VALUE (T series)
 30 ILLEGAL OFFSET NUMBER (M series)
 30 ILLEGAL OFFSET NUMBER (T series)
 31 ILLEGAL P COMMAND IN G10
 32 ILLEGAL OFFSET VALUE IN G10
 33 NO SOLUTION AT CRC (M series)
 33 NO SOLUTION AT CRC (T series)
 34 NO CIRC ALLOWED IN ST–UP /EXT BLK (M series)
 34 NO CIRC ALLOWED IN ST–UP /EXT BLK (T series)
 35 CAN NOT COMMANDED G31 (T series)
 36 CAN NOT COMMANDED G31 (M series)
 37 CAN NOT CHANGE PLANE IN CRC (M seires)
 37 CAN NOT CHANGE PLANE IN NRC (T seires)
 38 INTERFERENCE IN CIRCULAR BLOCK (M seires)
 38 INTERFERENCE IN CIRCULAR BLOCK (T series)
 39 CHF/CNR NOT ALLOWED IN NRC (T series)
 40 INTERFERENCE IN G90/G94 BLOCK (T series)
 41 INTERFERENCE IN CRC (M seires)
 41 INTERFERENCE IN NRC (T seires)
 42 G45/G48 NOT ALLOWED IN CRC (M series)
 44 G27–G30 NOT ALLOWED IN FIXED CYC (M series)
 46 ILLEGAL REFERENCE RETURN COMMAND
 50 CHF/CNR NOT ALLOWED IN THRD BLK (M series)
 50 CHF/CNR NOT ALLOWED IN THRD BLK(T series)