What causes FANUC alarm 5219?

Machine system or function indicated by the alarm name has detected a fault. Control parameter or configuration error related to the alarm condition. Hardware component fault on the CNC or machine. Part program error or illegal operation for the indicated function. Machine interlock or safety condition not satisfied.

How do I fix FANUC alarm 5219?

1. Note the alarm number and check the Fanuc alarm screen for any sub-code or additional details. 2. Identify the specific machine system or function from the alarm name. 3. Power cycle the machine to clear transient faults. 4. Consult the Fanuc parameter or operator manual for alarm 5219 specific remedy. 5. Contact Fanuc service if the alarm persists after basic troubleshooting.

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FANUC Controller

Program/G-code · Intermediate · 30-60 minutes

Alarm 5219

Fanuc Alarm 5219 - CAN NOT RETURN

Fanuc alarm 5219 CAN NOT RETURN occurs during program restart operations when the CNC cannot successfully return to the interrupted program position. This typically happens when restart search conditions are invalid, the program has been modified since interruption, or required restart data has been lost from memory.

FANUCProgram/G-codeIntermediate30-60 minutes

5219

Fanuc Alarm 5219 - CAN NOT RETURN

SYSTEM ALARM 5219

Root Cause Summary

Fanuc alarm 5219 CAN NOT RETURN occurs during program restart operations when the CNC cannot successfully return to the interrupted program position. This typically happens when restart search conditions are invalid, the program has been modified since interruption, or required restart data has been lost from memory.

Causes and Fixes

1
Press SYSTEM > ALARM to view detailed alarm information. Check if additional sub-codes or messages indicate program mismatch.
2
Verify program number and O-number match the original interrupted program. Compare program content against backup or original file if available.
3
Check Parameter 3109 (restart method selection). If restart data was saved, verify program has not been modified since save operation.
4
Cancel restart mode (reset CNC), reload original unmodified program, and execute normal cycle start from safe position instead of using restart function.
Ensure tool and workpiece positions are safe before manual restart

DIY Feasiblehigh confidence

Call a technician if:

·Memory corruption persists after P-CODE clear
·Parameter access issues
·Hardware memory failure suspected

Prevention

Always clear restart data before editing programs
Set restart points only at safe machining positions
Maintain proper backup battery voltage
Avoid setting restart points within subroutines or canned cycles

Common Mistakes

Setting restart points within G81-G89 canned cycles
Not clearing restart data after program modifications
Attempting restart from incomplete modal blocks
Ignoring battery voltage warnings that can corrupt restart data

Related Alarms

5218 5220 5221

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Always verify with your machine manual or a certified technician before performing service procedures.