Troubleshooting & Solutions
Prunarbo are designed for reliable performance, but if an error appears, don’t worry — it’s your device’s way of telling you what needs attention. This page provides a clear explanation of each fault along with step-by-step solutions.
Whether it’s a minor reset or a part that requires inspection, you’ll find the answers here. Follow the recommended methods to quickly restore your tool to optimal working condition and ensure safe operation.
If the problem persists after trying the solutions provided, please contact info@prunarbo.com. Our technical team is ready to assist you and ensure your product keeps performing at its best.
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PR-E50 Fault Indicators |
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| Number of buzzer rings | Breakdown | Solution |
|---|---|---|
| 1 | Abnormal battery power | Check whether the battery power is too low |
| 2 | Communication anomaly | Check whether the cable connectors of each part are loose |
| 3 | Abnormal opening | Blade refueling |
| 4 | Motor phase loss | Send it to the local dealer for maintenance |
| 5 | Motor phase line short circuit | Check the cable or connector for short circuit |
| The buzzer keeps ringing | Safety warning |
Check whether the body touches the blade |
| PR-E40 Fault Indicators | ||
| Number of buzzer rings | Breakdown | Solution |
|---|---|---|
| 2 | Undervoltage Protection | Charge promptly |
| 3 | Overvoltage Protection | Stop using and charging |
| 4 | MOS Overheat Protection | Stop using and cooling down |
| 6 | Hardware Overcurrent Exceeds Limit Protection | Stop using and cooling down |
| 7 | Phase Exceeds Limit Protection | Check the motor and circuit: check the motor winding, connections, and drive circuit for normalcy |
| 8 | Blade Initial Position Abnormal | Check the blade and sensor: check if the blade is stuck or deformed, and whether the sensor is functioning properly |
| 9 | Stop Running | Check whether the swing teeth are broken |
| 10 | Hall Board Communication Failed | Check the motor, motherboard, and Hall board wiring for abnormalities |
| 11 | Overcurrent Protection | Stop using and cooling down |
| PR-E50 & PR-E40 Common No-Alarm Troubleshooting & Solution | |
| Problem | Trouble-shooting Methods |
| Difficult to cut | Check whether the blade is worn again, if it is sharpened at the original angle |
| Blade Edge Chipping | When the shear's blade is open, shake the upper blade left and right to check the gap between the upper blade and the lower blade, and adjust the tightness in time |
| No Alarm Shutdown | Check the battery voltage and whether the power is sufficient |
| Jump gear /abnormal sound | If the branches cannot be cut, and you hear an abnormal sound, check whether the blade is too tight |
| PR-E8 Troubleshooting & Solutions | ||
| Problem | Possible Causes | Solutions |
| The guide bar and chain become hot and release smoke | The chain is too tight | Adjust the chain tension |
| The fuel tank is empty | Add lubricant | |
| Contamination has caused the exhaust port to become clogged | Remove the guide bar and clean the discharge port | |
| Contamination has led to the fuel tank becoming clogged | Clean the fuel tank and add new lubricant | |
| Contamination has caused the guide bar and fuel tank cap become clogged | Clean the guide bar and fuel tank cap | |
| Contamination has resulted in the sprocket or guide wheel becoming clogged | Clean the sprocket and guide wheel | |
| The motor is running, but the chain is not moving. | The chain is too tight | Adjust the chain tension |
| The guide bar and chain are damaged | Replace the guide bar and chain | |
| Motor damage |
1. Remove the battery from the machine 2. Remove the guide bar cover 3. Remove the guide bar 4. Clean the machine 5. Install the battery and operate the machine 6. If the sprocket turns, it indicates that the motor is working properly. If not, contact the customer service.
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| The motor is running and the chain is moving, but the chain is not cutting | The chain is blunt | Replace the saw chain |
| The direction of the chain is incorrect | Turn the chain link to the other direction | |
| The chain is either tight or loose | Adjust the chain tension | |
| Adjust the chain tension | Cut about 10 times | Rotate the yellow knob to adjust chain tension distance 1-3 mm (0.12 inch) |
| When one or two indicator lights on the battery pack are flashing, and the machine fails to start | The capacity of the battery pack is very small |
1. Cool the battery or the machine down to ambient temperature. 2. Recharge the battery. 3.Restart the machine. |
| The battery or control board is in overheat protection mode | ||
| The motor is running, but the chain is not cutting properly, or the motor stops after approximately 3 seconds | The machine is in protection mode to safeguard the PCB | Release the trigger and start the machine again. Do not force the machine to cut. |
| The battery is not charged | To charge the battery, please refer to the battery and charger manual for the correct charging procedure | |
| The chain is not lubricated | Lubricate the chain to reduce friction, and do not operate the guide bar and chain without sufficient lubrication. | |
| The correct storage temperature for batteries | Cool down the battery pack until it reaches ambient temperature. | |