Cordless Trimmer Head Not Feeding? Troubleshooter
Most feed problems are how the line was wound.
Take the battery out before you check or clear anything on the tool. Work through one question at a time. You can go back or start over whenever you like.
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Safety: this troubleshooter is general information. Follow your battery and tool maker's instructions. Don't open a pack or a mains-powered charger, bypass a protection board or force-charge a rejected pack.