EGO ST1521S PowerLoad Trimmer 15 in 56V Cordless String Trimmer with Automatic Line Feed TOOL-NO-START Error Fix: Tool Will Not Start

Error code TOOL-NO-START on the EGO ST1521S PowerLoad Trimmer 15 in 56V Cordless String Trimmer with Automatic Line Feed means: Tool Will Not Start. The tool does not respond when the trigger or start button is pressed with a charged battery installed — verify the battery is fully seated (listen for click), check that the safety switch or bail lever is engaged (all EGO tools require a two-step start: safety button + trigger), clean the battery contacts, and try a known-good battery to isolate whether the issue is the battery or tool

The most successful fix is "Test and Replace the Trigger Switch Assembly" (medium difficulty, ~45 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Test and Replace the Trigger Switch Assembly") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Needle-nose pliers.

DIY cost: $10-$20. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The EGO ST1521S PowerLoad Trimmer 15 in 56V Cordless String Trimmer with Automatic Line Feed has 8 other known error codes, including: BAT-1-FLASH (Battery Single LED Flashing), BAT-COLD (Battery Too Cold to Operate), BAT-HOT (Battery Overtemperature Protection), BAT-LEDS-OFF (Battery LEDs Not Lighting Up), BAT-NOT-RECOGNIZED (Battery Not Recognized by Tool), and 3 more.

Error code TOOL-NO-START also appears on 11 other EGO models: CS1401 14 in 56V Brushless Motor Cordless Chainsaw with Rapid Reload Chain Tensioning, EGO POWER+ CS1804 18-Inch 56V Cordless Chainsaw with Chain Tensioning, EGO POWER+ EA0800 56V 8-Inch Cordless Edger, EGO POWER+ HT2411 24-Inch 56V Cordless Hedge Trimmer, EGO POWER+ LB6000 56V 615 CFM Cordless Leaf Blower, EGO POWER+ LB6504 56V 650 CFM Cordless Leaf Blower, and 5 more. The fix may vary by model, so check each model's specific page for tailored repair steps.