Troubleshooting - DeWalt DCST920 Instruction Manual

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Problem
Unit will not start.
Unit shuts down in use.
Battery won't charge.
Appliance runs slowly.
Trimmer is vibrating.
Solution
• Check battery installation.
• Check battery charging requirements.
• Check that lock off is fully pulled back prior to moving main trigger.
• Charge battery.
• Clear debris around spool.
• Reduce/limit swath to 13 inches (330 mm) MAX.
• Reinstall guard if it has been removed.
• Insert battery into charger until red charging light illuminates. Charge up to 8 hours if battery is
totally drained.
• Plug charger into a working outlet. refer to Important Charging notes for more details.
• Check current at receptacle by plugging an appliance.
• Check to see if receptacle is connected to a light switch which turns power off when you turn
out the lights.
• Move charger and appliance to a surrounding air temperature of above 40 °F (4.5 °C) or below
105 °F (40.5 °C).
• Fully depress the variable speed trigger. The level of trigger depression affects speed.
• If appliance still runs slowly, remove battery from appliance.
• Check that the spool housing can rotate freely. Carefully clean it if necessary.
• Check that the cutting line does not protrude more than approximately 4-13/16" (122 MM) from
the spool. If it does, cut it off so that it just reaches the line trimming blade.
• Make sure both cutting lines are the same length.
• Check to see if the spool is properly wound. If spool is broken then replace spool.
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