Hold or press the green power button on the display until it turns red.Navigate to the Menu on the PLC.Go to the maintenance menu.Go to valve controls.From here you can manually actuate the bypass valve or any valve in the cabinet. Leave the bypass active or in the on position to bypass the generator. The following models utilize auto-bypass: FPS-1650, FPS-3250, FPS-5000, FPS-10000, FPS-16500, and FPS-22500