Evaluation results: one level 1 hotline low flow system (hl 390) was returned for investigation in excellent condition.The reason for the product return was not provided.Visual inspection did not reveal any damage on the device.Following the visual inspection, the investigator filled the tank with water, plugged in the line cord, and turned on the power switch.The investigator noted the device exhibited a safety/electrical test failure due to a loose ground stud.The problem source of the reported product problem was unknown.A root cause was not established.The ground stud was tightened.This measure corrected the product problem.Preventative maintenance was then performed, after which, the device passed all the functional tests.
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