I was called to a home to inspect a home's air conditioning system. Upon arrival, I discovered that the system was not cooling. I inspected the air handler unit (AHU) and found that the float switch was wet. The customer explained that maintenance personnel had flushed the drain line from the outside main drain. I informed the customer that we needed to flush the drain line from the inside and perform a drain line treatment. The customer agreed to the treatment and I performed the drain line treatment. The drain line was pretty clogged, and I did my best to flush it. However, it appears that the main drain from the building has built up in it. I let the system run for 15 minutes to ensure that it was not getting water in the float switch again. After 15 minutes, there was water in the float switch. I sucked out the water again and hit it with nitrogen. I did not check pressures or subcool and superheat because the unit is in the roof and I would have to get the key from the maintenance