Hi, I have a 4 year old jandy lrz heater that's been acting up. The heater had started to turn the cover around the exhaust black and at the same time said fuse link fault. I opened the exhaust vacuumed it out and then used compressed air just to be safe. After that I replaced the fuse link but now my display is dead and I'm not sure what the issue could be. I checked the breaker, flipped it a few times but no luck. I looked inside and could see no visible issues. Any help would be greatly appreciated. Thanks