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Haas alarm

186 Spindle Not Turning

The control commanded the spindle to turn, but it did not see it moving.

Stops the machineHaas Classic and NGC controls (mills and lathes)

What it means

The control commanded the spindle to turn, but it did not see it moving.

Common causes

  • Spindle drive fault
  • Broken or slipping belt
  • Spindle mechanically locked
  • Encoder or cable problem

What to check first

  1. Check the spindle drive for a fault light
  2. Power off and see if the spindle turns by hand
  3. Check belts

Lock out the machine before reaching into it. Never bypass a door switch or interlock to clear an alarm.

When to call a repair tech

If the drive shows a fault or the spindle is tight, call a tech.

Repair companies that work on Haas

See all Haas repair

Quick answers

What does Haas alarm 186 mean?

The control commanded the spindle to turn, but it did not see it moving.

What causes Haas alarm 186?

Spindle drive fault. Broken or slipping belt. Spindle mechanically locked. Encoder or cable problem.

How do I fix Haas alarm 186?

Check the spindle drive for a fault light. Power off and see if the spindle turns by hand. Check belts. If the drive shows a fault or the spindle is tight, call a tech.

Alarm numbers and text can differ by control model, software version and machine builder. This page is a starting point from people who have worked on these machines, not a replacement for your machine builder's manual.

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