Symptoms
- Pull cord does nothing on gas models
- Battery model shows no lights or won't power on
- Engine sputters and dies quickly
- Blades don't move when triggered
Likely causes
- CommonStale fuel (gas models)Old gasoline gums the carburetor and prevents starting.
- CommonDischarged or faulty battery (battery models)Batteries lose charge in storage or wear out over time.
- CommonFouled spark plug (gas models)Carbon buildup weakens spark.
- PossibleSafety switch or trigger interlock not engagedMost trimmers require two-hand or interlock switches pressed simultaneously.
- PossibleJammed blades from debrisTwigs or debris stuck between blades can prevent the motor from engaging.
What to do
- For gas models, check fuel freshness and replace if old.
- For battery models, charge the battery fully and confirm it clicks securely into place.
- Check that all safety switches or triggers are pressed together as designed.
- Pull the spark plug on gas models and inspect for fouling.
- Clear any debris jammed between the blades with the tool powered off and battery removed or plug disconnected.
- Inspect the power cord on corded electric models for damage.
- If a gas model still won't start, the carburetor may need cleaning by a professional.
Tools and parts
- Spark plug socket (gas models)
- Battery charger
Hedge trimmer replacement batterySearch: “hedge trimmer battery replacement”
Spark plugSearch: “hedge trimmer spark plug”
When to call a pro
If a gas trimmer's carburetor needs service or a battery model's motor has failed, a small-engine or power tool repair shop can help.
Safety
Use caution
Always remove the battery or disconnect the spark plug before clearing jammed blades.