My line from my exterior AC unit is dripping at the furnace. The dripping over time has caused rusting and we've had to replace the control board under it. It appears the root cause of the problem wasn't fixed. The pipe drips when the AC is running. I have re-insulated it (before it looked like it had poor insulation) and it is still dripping. Is there anything else I can do to fix it? Is there a proper gasket to put on the connection of the pipe to the side of the furnace that I need?
I've checked the condensate drain line and it appears it's working. I opened the furnace and there is some standing water in the pan but nothing high enough to reach this line where the water is coming out. The metal pipe on the right is the condensate drain line, and the two pipes above to the left are the lines to the AC. The larger line is dripping water.