failure mode
FM-05: FM-05 TRIGGER STICKS, SPEED IS ERRATIC, OR TOOL WILL NOT STOP
FM-05 TRIGGER STICKS, SPEED IS ERRATIC, OR TOOL WILL NOT STOP
Diagnostic overview
FM-05 TRIGGER STICKS, SPEED IS ERRATIC, OR TOOL WILL NOT STOP
Likely Root Causes
- Dry debris obstructs trigger travel
- Housing impact pinches the trigger guide
- Trigger return or switch is damaged
- Electronic speed control is faulty
- Liquid or solvent entered the control area
Quick Checks
- Speed follows trigger pressure and release stops the tool.
Repair Preview
1.
This is a preview of the troubleshooting guidance included in the full repair manual.
Related symptoms
Trigger binds, fails to return, changes speed erratically, or does not stop the drive.
Trigger binds, fails to return, changes speed erratically, 1. Remove battery immediately; stop cycling the trigger.
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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