I have a Waterfurnance 5 series with DSH, aux heat, 6 ton unit, closed loop system about 5-6 feet deep, 6 ton system heating/cooling about 4200 sq feet (which includes the 1200sq foot unfinished basement). I have the serial number posted in my other thread I started. The unit seems to be working properly, only been here a few months, electric usage isn't scary and our home is comfortable. I opened up the cabinet to get a visual on the goods, saw the two control boards and the intellistart. I also saw what looked like Christmas lights, tis the season! Could someone explain these LED codes to me? ABC Board LED 1 - 9 rapid flashes, off , solid illumination for a second - off - repeats LED 2 - 3 rapid flashes, pauses, 6 rapid flashes, pause, 7 rapid flashes, pause - repeat LED 3 - illuminated green AXB Board LED 1 - illuminated for 2 seconds (green) off for 2 seconds - repeat LED 4 - 2 rapid flashes , off , repeat. Thank you for your time and helping with my ignorance. These all seemed unimpressive from what I could interpret of the manual but it was hard to understand for me as I'm not familiar with the lingo.