EGO ST1521S PowerLoad Trimmer 15 in 56V Cordless String Trimmer with Automatic Line Feed HEAD-WOBBLE Error Fix: Trimmer Head Wobbles or Vibrates

Error code HEAD-WOBBLE on the EGO ST1521S PowerLoad Trimmer 15 in 56V Cordless String Trimmer with Automatic Line Feed means: Trimmer Head Wobbles or Vibrates. The trimmer head wobbles during operation, causing uneven cutting and excessive vibration — the trimmer head may not be threaded on tightly, the head may be cracked, the drive shaft may be bent, or the arbor bolt and washer may be missing; stop the trimmer, remove the battery, and check that the head is tightly secured and undamaged

The most successful fix is "Replace Trimmer Head Components and Inspect Drive Shaft" (hard difficulty, ~45 minutes). Estimated DIY cost: $15-$30. 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 ("Replace Trimmer Head Components and Inspect Drive Shaft") is rated hard difficulty and takes about 45 minutes. Tools needed: Wrench set, T25 Torx screwdriver, Multimeter.

DIY cost: $15-$30. Professional repair typically costs $140-$200. 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.