I don't have that generation of generator and thus don't have hands-on experience. I do believe, though, that the alert is time-based. There's a clear function in the menu that your book should help you access.
I have a model 55020 (10 kw) generator with a wireless monitor. The monitor is now displaying an alarm message "Warning Sevice Date". It has been a year since the generator was installed. All maintenance has been performed by me as required. The generator display shows no alarm. How do I clear the alarm? The monitor has a slide switch on its left side. Does anyone know its function?