Code 644: RP-Pallet Changer Will Not Raise...
Issue Description & Safety Warning
The Haas VF-Series CNC has triggered a critical RP-Pallet Changer Will Not Raise... 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
The pallet did not begin to lift within a reasonable time after command, or did not complete lifting within a reasonable time. Verify air supply to the pallet changer valve assembly, verify proper adjustment of the lift cylinder regulator (40 PSI), verify the function of the lift cylinder air valve and solenoid, verify the operation of the lift cylinder position sense switches. After correcting the condition, run an M50 to continue machining.
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 644 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.
Have a better solution?
Help the industrial community by sharing your repair experience for code 644.
Need a searchable reference for more Haas VF-Series CNC manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026