I have a Hayward Aquarite SWG that has no led lights on. When I first turn the control box on the no flow light flashes, it goes out then the power and generating lights come on, then all leds turn off. This unit is about 4 years old. I removed the board thinking i would see burnt areas on the back which may indicate which component on the board may be in need of replacement as I have read on other posts but nothing is burnt. My limiter has no cracks. Puzzled.