I can not tell what the beeping sound is for because my guage has moisture in it. After warm up I started to ease into the throttle and shortly after getting on plane it started to beep at first intermittenly and then more almost solid tone. I am hoping this is not serious because I only have about 3.25 hours on a brand new powerhead. This is the second Mercury Powerhead this year. I dont know what else to do. I had good steady water flow from the engine. I let it warm up for about a minute and thirty seconds. It has been running great until just now. I did however shut it down and troll back to my dads as soon as I heard the alarm. Last edited by Quik13 on August 7th, 2010, 8:44 pm, edited 1 time in total.