Arrived on site and found ice machine about to harvest. Bin nearly full and all ice very thin poor quality ice. Watched harvest to find small amount of ice drop while the rest stayed in evaporator section. Ice not formed enough to open flapper to drop. Forced harvest to remove remaining ice from plate. Inspection through unit found evaporator plate dirty, distribution head crusted with scale, and pan loaded with scale. Began to run descaling cycle on system before full breakdown of all water components. Descaled and removed all foreign material from all water components outside of system including plastic tab found in sump. Rinsed and reassembled for sanitizing cycle on system. Finished cycle. Watched system produce ice. Machine began to harvest to quickly and produced thin ice. Found ice adjustment setting on lowest mark. Adjusted and retested. System still produced thin ice. Found water to be dripping consistently from side of water trough. Water pan losing water to point of tripping