I was called out to a home where the air conditioner had completely shut off and there was water pooling around the indoor unit. I found that a clogged condensate drain line had triggered the system's safety float switch to prevent water damage. I solved the issue by using a specialized vacuum to clear the blockage and flushing the entire line with pressurized nitrogen to remove any remaining buildup. After confirming the line was draining freely, I reset the system, restoring cooling to the home and preventing a major water leak.