Is your Sun Joe cordless grass trimmer or trimmer + edger not starting, even though the battery is charged? Or is the trimmer running but not cutting effectively?
This guide covers common no-start problems and cutting-performance checks for selected Sun Joe cordless grass trimmers. Some steps apply broadly, while others are specific to the cutting system used by your model.
Models Covered in This Article
The following Sun Joe models and kits are identified on ShopJoe.com. Use the general troubleshooting steps for the appropriate cordless grass trimmer, then follow the cutting-system guidance for your model.
24V IONMAX Nylon-Blade Grass Trimmers
24V-GT10-LTE
10-inch cordless stringless grass trimmer kit with disposable nylon blades.
24V-GT4MAX-LTE
Cordless garden combo kit containing a GT10-style nylon-blade grass trimmer. This article covers its grass trimmer, not the other tools in the kit.
24V-HT18-GT10-LTE
Hedge trimmer and 10-inch stringless grass trimmer combo kit. The grass trimmer uses disposable nylon blades.
Other 24V IONMAX Grass Trimmers
24V-ST14
12-inch cordless string trimmer + edger. Uses trimmer line and a spool rather than disposable GT10 nylon blades.
24V-ST14-CT
Tool-only version of the 24V-ST14 string trimmer + edger. Battery and charger are sold separately.
24V-SB10-LTE
10-inch cordless SharperBlade stringless lawn trimmer + edger. Uses SharperBlade cutting components, not GT10 nylon blades.
Important: The general battery, starting, and obstruction checks may apply to these cordless grass trimmers, but starting controls, battery requirements, cutting heads, and replacement parts differ by model.
Always follow your model's operator's manual. The nylon-blade replacement instructions below apply specifically to the 24V-GT10-LTE grass trimmer and its corresponding combo-kit versions.
Safety First
Turn off the trimmer and remove its battery before inspecting, cleaning, clearing obstructions, or replacing cutting components. Wait for all moving parts to stop completely.
Wear appropriate eye protection, keep hands away from the cutting head, and never operate the trimmer without its required guard.
Trimmer Will Not Start
If your cordless trimmer does not start, work through these checks in order.
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Check the Battery Charge
Check the battery's charge-level indicator, if equipped. Make sure the battery has enough charge to operate the trimmer.
For compatible 24V IONMAX batteries with a three-light status indicator, one or no illuminated lights may indicate a low or depleted charge. Recharge the battery as directed by its manual.
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Remove and Reinstall the Battery
With the trimmer switched off, remove the battery and slide it back into the battery compartment.
Make sure it clicks or snaps securely into position and is fully seated before attempting to start.
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Check Battery Temperature
Do not operate the trimmer with an overheated battery.
If the trimmer stopped during use, the battery or motor may have overheated. Allow the equipment to cool completely before further checks.
For the GT10 guidance, approximately 30 minutes may be needed. Actual cooling requirements vary by model and conditions; follow your manual.
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Check the Cutting Head
Before starting, make sure the cutting head is not pressed against the ground, grass, or another object.
If grass or debris is wrapped around the cutting head or shaft, remove the battery and clear the obstruction according to your operator's manual.
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Use the Correct Starting Sequence
On models equipped with a safety-lock button and trigger switch:
- Press and hold the safety-lock button.
- While holding the safety-lock button, squeeze the ON/OFF trigger.
- Once the trimmer starts, release the safety-lock button and continue holding the trigger as directed.
Starting controls can vary. Always follow the instructions for your specific model.
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Check With Another Compatible Battery
If you have another compatible, undamaged battery approved for your trimmer, you may try it to help determine whether the issue involves the original battery.
Never substitute a battery from a different voltage platform.
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Retest the Trimmer Once
After confirming the battery is charged, correctly installed, at a safe temperature, and the cutting head is clear, try the correct starting sequence again.
If the trimmer still does not start, stop troubleshooting and contact Shop Joe Customer Support.
Trimmer Runs but Does Not Cut Well
Cutting-performance troubleshooting depends on the type of cutting head installed on your trimmer.
GT10 Nylon-Blade Trimmers
For the 24V-GT10-LTE and the corresponding GT10 grass trimmers included in combo kits:
- Replace worn or broken blades. The GT10 uses disposable nylon blades instead of traditional trimmer line. Replace blades that are worn, chipped, or broken.
- Use the correct replacement blades. The 24V-GT10-LTE kit includes 11 nylon blades. Additional blades are sold separately.
- Cut in stages. For tall or thick growth, trim from the top down in several passes.
- Keep the guard installed. Never operate the trimmer without its required safety guard.
ST14 String Trimmers
The 24V-ST14 models use trimmer line and a spool. If cutting performance is poor, check the line and spool according to the operator's manual. Do not use GT10 nylon replacement blades on an ST14 trimmer.
SB10 SharperBlade Trimmers
The 24V-SB10 models use the SharperBlade cutting system. Inspect and replace cutting components only as directed in the SB10 operator's manual. Do not substitute GT10 blades or ST14 trimmer line.
What If the Battery or Tool Appears Damaged?
Do Not Use Damaged Equipment
Do not use a damaged or modified battery or trimmer. Do not open, disassemble, or attempt to repair the battery or internal electrical components.
If the battery is swollen, cracked, leaking, or unusually hot, discontinue use and contact Shop Joe Customer Support.
Battery contact reminder: Inspecting or adjusting individual battery prongs is not part of the standard customer no-start checks described in this guide.
Focus on battery charge, proper installation, safe temperature, and the correct starting procedure.
When to Stop Troubleshooting
Stop using the trimmer and contact Shop Joe Customer Support if:
- The trimmer produces smoke, sparks, or a burning smell.
- The battery is swollen, cracked, leaking, or very hot.
- The housing, guard, shaft, or another component is damaged.
- The trimmer will not start after the appropriate checks with a fully charged battery.
Smoke or burning smell? Stop using the product immediately. For safety instructions, see What Should I Do If My Unit Is Smoking or Smells Like It's Burning?.
Check Your Model's Manual
Starting controls, battery requirements, cutting-head designs, and replacement procedures vary by model.
Visit the Shop Joe Product Manuals page and search using the complete model number from your trimmer or kit.
Information to Have Ready
When contacting support, please prepare:
- Complete product model number
- Serial number, if available
- Battery model number
- Description of the starting or cutting-performance issue
- Order number, if available
Need More Help?
If your Sun Joe cordless grass trimmer or edger still will not start, or continues to have cutting-performance issues after the appropriate checks, contact Shop Joe Customer Support for assistance.
Have your complete product model number, battery model number, and a description of the issue ready.