# Technical Support
Thank you for choosing JINTOP solar water pumps.
On this page you can find basic technical guidance, parameter tips and common‑issue troubleshooting for our DC brushless solar submersible pumps.
## Installation Guidance
• Confirm matching voltage and current before power‑on.
• Please check rotation direction, cable sealing and well depth before putting the pump into the well.
• Our pumps are equipped with external MPPT controllers; please strictly follow the wiring diagram for connection.
## Recommended Operating Parameters
• Please operate within the recommended voltage and current range for your pump model.
• Avoid over‑voltage or over‑current input to protect brushless motor and controller.
## Common Troubleshooting
1. Pump does not start: Check solar panel connection, input voltage and controller status.
2. Low water flow: Check pipe blockage, actual sun‑light intensity and pump submersion depth.
3. Controller alarm: Shut down power supply first, check wiring and load condition.
For custom technical consultation, model selection or after‑sales questions, please contact our team via email or WhatsApp.
Please provide your pump model and detailed fault description, so we can give you fast and accurate support.