IMPORTANT: Any time you install or remove components, disconnect power to the unit before you begin. "Hot Plugging" components in this manner can cause even further damage to one or more cabinet components.
To power down a LTC system, flip the black circuit breaker on the power supply inside the cabinet to the "Off" position.
Test the functionality of the pump common by replacing it with a known operational pump common. If the issue still exists, the problem lies with the distribution board, and it must be sent in for reconditioning. Create a UPS Shipping Label HERE.