my 115 is doing what it is supposed to do as far as shutting itself down and reducing the rpms to protect itself, the dash says it is running hot, motor has new impeller and new thermostats - water stream is strong - soon as it shuts down I can place my palms on the heads and hold them there with no problem, so I know it is not running hot - any ideas as to why the buzzer is going off and the motor goes into low rpm?