failure mode

FM-05: FM-05 THE TRIGGER STICKS, RUNS ON, OR SPEED RESPONSE IS UNSAFE

FM-05 THE TRIGGER STICKS, RUNS ON, OR SPEED RESPONSE IS UNSAFE

Diagnostic overview

FM-05 THE TRIGGER STICKS, RUNS ON, OR SPEED RESPONSE IS UNSAFE

Likely Root Causes

  • Dust or debris obstructs trigger travel
  • Trigger shoe or housing is cracked or distorted
  • Direction button is partially engaged
  • Switch return spring or contacts have failed
  • Internal wiring, brush, or motor fault causes erratic response

Quick Checks

  1. Soft dry brush; known-good compatible battery.

Related symptoms

  • The trigger binds, the drill continues after release, or speed does not follow trigger pressure safely.

    The trigger binds, the drill continues after release, or speed If the drill runs on, release it, center the direction button, and remove FM-05

Included in the full manual

  • root cause analysis
  • tools needed
  • step-by-step repair procedure
  • diagrams
  • exploded views
  • post-repair checks

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