Code 120: Low Air Pressure
Issue Description & Safety Warning
The Haas VF-Series CNC has triggered a critical Low Air Pressure alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Air pressure dropped below 80 PSI for a period defined by Parameter 76. The LOW AIR PR alarm will appear on the screen as soon as the pressure gets low, and this alarm appears after some time has elapsed. Check your incoming air pressure for at least 100 PSI and ensure that the regulator is set at 85 PSI.
Source: Haas VF-Series Service Manual (96-8100 rev G, 2003)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Haas VF-Series CNC Alarms
Haas controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 120 on the VF-Series CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Haas's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 461 Haas VF-Series CNC codes.
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