Fanuc 952: Fanuc 0i Error Code 952

Symptoms

The CNC power supply voltage is out of specification. System alarm 952 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 (952) 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 952 mean?
Power Unit Voltage: The CNC power supply voltage is out of specification.
Q: Is Fanuc alarm 952 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.

Fanuc 0i Error Code 952