Does your condensate line drain to daylight? If it does, a friend in the HVAC biz advised me he keeps a piece of 3/4" PVC with and 90 elbow on the end stashed in his truck. If he encounters a clogged condensate drain, he slips the elbow over the end of the drain and blows into it to dislodge the clog. He said a big rush of water usually follows.

The P trap on my indoor unit in my attic clogged last week in the middle of the night. Caused the indoor unit's condensate to run into the overflow pan. Since the pan drains into the same line as the main condensate drain, the pan filled up and overflowed as well. We found out when it ran through the ceiling.

In my case, the main and overflow drains connect into a vent line in my attic. The water flows into the sanitary sewer. That means I couldn't do the blow up the drain trick. I had to cut my lines and remove the P trap to unclog it. Did this at 2 AM. Not fun.

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