If you notice sparking from the control box, it may be due to the grounding cable not being connected during installation. The grounding cable is essential for the safe and proper operation of the control box, as outlined in the user manual. Failing to attach this cable can cause significant damage to the control box, which will need to be replaced. Unfortunately, once the control box is damaged in this way, it cannot be repaired, and a new one must be purchased.
To prevent this issue, always ensure that the grounding wire is securely attached during installation. If you're unsure about the installation process, please refer to the user manual or contact customer service for further assistance.