What does it mean if there’s a slow blinking red light when I close the lid? June 22, 2022 19:01 Updated This means the Engine batteries are low. Replace with two new AA alkaline batteries and try again. Related articles What does it mean if there’s a single red light flash when I close the lid? Will OnDemand test results for a minor dependent automatically be loaded into an existing linked Labcorp Patient account? Does a result above 55 M/mL mean we will get pregnant faster? What does this mean when the Engine stops running and shows a blinking red light? Do I need a prescription to use the Men’s Rapid Fertility Test?