For this job, when I arrived at the customers house, the furnace blower was running still. Giving an error code of 56 and 44. I proceeded to checked the drain line and found there was water back up. After blowing into the drain line, the blockage gave away and started draining properly. Turning the furnace off and back on, I let the system ran for 15 minutes and found no other issues with the system. The customer has heat now.