What causes Haas alarm 5?

Machine was powered on but operator did not press POWER UP/RESTART button to initiate automatic homing sequence on all axes. One or more axes failed to complete homing cycle due to proximity switch failure or encoder feedback issue preventing zero reference establishment. E-stop was activated or power interruption occurred after partial homing leaving some axes zeroed and others in unknown position state. Homing routine was bypassed or cancelled by operator before all axes reached their home switches and established reference positions. IOCON board is not receiving valid home switch signals due to wiring fault or failed proximity sensor at axis home position.

How do I fix Haas alarm 5?

1. Step 1: Press POWER UP/RESTART button and allow all axes to complete their automatic homing sequence without interruption until Power On Hours timer begins counting 2. Step 2: Observe each axis during homing to verify movement toward home position and deceleration when approaching the proximity switch location 3. Step 3: If any axis fails to home, navigate to Diagnostics page and verify the home switch input changes state when manually moving axis to home position 4. Step 4: Check Setting 1 to confirm it is set to zero which enables automatic homing on power up rather than manual homing requirement 5. Step 5: Inspect home proximity sensor wiring and connector at IOCON board for the axis that will not zero checking for damaged pins or loose connections 6. Step 6: Manually jog the non-homing axis to the approximate home position and verify the proximity sensor target flag passes through sensor beam with correct gap spacing

Haas codes

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Haas Controller

Servo/Axis · Basic · 5-10 minutes

Alarm 5

Haas Alarm 5 - Machine Not Zeroed

Alarm 5 fires when the way lubrication oil level drops below the minimum threshold detected by the float-style level switch in the way oil reservoir. The NGC control continuously monitors this sensor and prevents machine operation when insufficient lubrication is detected to protect linear guideways and ballscrews from damage.

HaasServo/AxisBasic5-10 minutes

5

Haas Alarm 5 - Machine Not Zeroed

Not Zeroed

This alarm appears when the operator attempts to run a program or enter certain modes without first establishing machine zero reference positions through the homing cycle. The MOCON board tracks whether each axis has successfully completed its home routine and found the proximity switch reference point since the last power-up. Until all required axes show a valid zero reference, the control restricts certain operations to prevent crashes or coordinate system errors that could result from unknown machine position.

Root Cause Summary

Safety

Position accuracy unknown

Causes and Fixes

1
Check Oil Level Visually
Open electrical cabinet and locate the way oil reservoir tank. Check oil level against minimum mark on tank sight gauge.
Ensure machine is powered off and locked out before opening electrical cabinet
2
Add Approved Way Oil
Add only Haas-approved way oil (Mobil Vactra #2 or equivalent ISO VG 68) to bring level above minimum mark but below maximum.
Fill slowly to avoid overfilling - excess oil can cause over-lubrication issues
3
Reset Alarm and Test
Press RESET button to clear alarm. Cycle power if alarm persists. Verify float switch operation by gently lifting float manually.
Listen for relay click when float moves past switch point

DIY Feasiblehigh confidence

Call a technician if:

·Float switch replacement required
·Internal pump failure suspected
·Persistent leaks after repair attempts

Prevention

Check way oil level weekly during daily maintenance
Use only Haas-approved way oil (ISO VG 68)
Replace oil filter per maintenance schedule
Keep reservoir tank and float switch clean

Common Mistakes

Using incorrect oil viscosity
Overfilling reservoir causing float switch issues
Ignoring small leaks that lead to low oil conditions
Not cleaning float switch during oil changes

Related Alarms

ALARM 6 ALARM 7

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