Install two replacement high voltage fuses for the hot water generator and flow center 10a glass buss (Waterfurnace premier control board) Reconnect flow center high voltage power to the correct fused relay circuit of the water furnace premier control board Run test system in cooling mode to test flow center antifreeze fluid level Refill two-three gallons freshwater into QT non-pressurized flow center Suspect ground loop has micro or pinhole leaks. Antifreeze level is down since May Recommend homeowner inspect and refill every 1 to 3 months