I just bought new goodman 3 ton gas furnace and ac system. When I started the ac unit the blower fan came on but constantly stays on even though it is on AUTO position it stays on regardless of temprature or even after I turned the unit OFF from COOL. The LED flashes 6 times which says OPEN START CIRCUIT (CURRENT ONLY IN RUN CIRCUIT). What should I do? I opened the door to stop the fan but as soon as I put door back the blower fan comes on even though the system is OFF.