Hello all. Been having an issue with a 2001 XR6 Merc 150 HP. Brand new controls with new 2006 boat.<br /><br />Chirping sound (alarm) has been intermitent and driving me nuts. Chirping may go intermitently from barely audible to constant and very audible (as if overheat alarm)unless I do the following: Nothing; slow down; speed up; hit the TT switch.<br /><br />I have checked/done the following:<br />disconnected heat sensors, no change; complete water pump replacement; new thermostats and complete flush (I appear to have good flow and pressure, although not verified).<br /><br />Are there other alarms I do not know about??<br />Could this have anything to do with the Popit Valve?