Conservatory in Phoenix taught me to always check the drain line slope first
Back in 2015, I got called to a commercial ice machine at a conservatory attached to a museum. Thing was down every three weeks like clockwork. Previous guy kept swapping parts. I crawled under and found the drain line had a low spot about 4 feet from the machine. Water pooled, froze, backed up. Repiped it with a straight drop and never heard from them again. $45 in parts, saved them thousands. After that, I started checking drains before I even pull a panel. How many of you have found something similar that was the real root cause?