Applicable Systems
Series 0i
Series 16/18/21
Alpha
Beta
Symptoms
A memory board communication error has occurred. System alarm 949 is displayed on the CNC screen.
Possible Causes
- Internal CNC system hardware failure
- RAM/ROM/flash memory corruption or degradation
- Power supply instability or interruption
- Environmental factors (EMI, temperature, humidity)
Troubleshooting Steps
- Step 1: Record the full alarm code (949) and all displayed alarm messages
Complete alarm information documented for service - Step 2: Try powering off the machine completely, wait 30 seconds, and power on again
If the alarm clears, monitor for recurrence; if it persists, hardware service is needed - Step 3: Check the CNC battery status and replace if low (alarm 947 indicates low battery)
Battery voltage within specification after replacement - Step 4: If the alarm persists after power cycle, contact FANUC service for hardware diagnosis
FANUC service technician diagnoses and replaces faulty board/module
How to Reset
Power off the machine completely, wait 30 seconds, power on. If the alarm persists, contact FANUC service. Do not attempt to continue operation with system alarms active.
Common Replacement Parts
- varies: CNC control board or module (per FANUC service diagnosis) (Do not replace CNC boards without FANUC service authorization)
Frequently Asked Questions
- Q: What does Fanuc system alarm 949 mean?
Memory Board Communication: A memory board communication error has occurred.
- Q: Is Fanuc alarm 949 serious?
Yes, system alarms (900-series) are critical and indicate internal hardware or software faults. Do not continue operation; power cycle and contact FANUC service if the alarm persists.
Source: Fanuc 0i/0iMate System Alarm Code List, FANUC Corporation
Category: CNC