Applicable Systems
Haas CNC Mill (VF/VM Series)
Symptoms
Alarm 402: Tool Arm Error. The ATC arm position is incorrect or the arm sensor failed.
Possible Causes
- Hardware or system issue related to: Tool Arm Error
- Component failure or connectivity issue
- Environmental or operational factor
- Configuration or parameter mismatch
Troubleshooting Steps
- Step 1: Read alarm 402 on the Haas control display
Alarm code and description captured - Step 2: Check machine status and inspect related components for visible issues
Fault identified or confirmed intermittent - Step 3: Consult the Haas service manual for alarm-specific procedures
Root cause identified per Haas guidelines - Step 4: Apply the recommended fix and reset the alarm
Alarm cleared, machine resumed normal operation
How to Reset
To reset: 1) Address the root cause of alarm 402. 2) Press RESET on the Haas control. 3) If alarm persists, power-cycle the machine. Caution: Do not bypass safety interlocks.
Frequently Asked Questions
- Q: What does Haas alarm 402 mean?
Alarm 402 indicates: Tool Arm Error. The ATC arm position is incorrect or the arm sensor failed.
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Source: Haas Automation Service Manual, cnccode.com/errorcodefixes.com
Category: CNC
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