Evaluation results: one level 1 hotline low flow system was returned for investigation in used condition.Visual inspection revealed wear and tear damage on the following components; enclosure, front cover, tank cover, line cord, and pole clamp. there was also a broken micro switch and stripped interlock block. the pcb and power switch on the unit were also outdated.The investigator subsequently filled the tank with water, attached a temp-check, plugged in the line cord, and turned on the power switch.The customer reported product problem (disposable error) was confirmed during testing.The product problem was attributed to a broken micro switch.The device history record was reviewed and showed that this device met all manufacturing specification for product released for distribution.No issues were identified that would have impacted this event.The problem source of the reported product problem was unknown.A root cause was not established.The following components were replaced: enclosure, tank cover, front cover, interlock block, micro switch, line cord, pole clamp, and reflux plug. the investigator also upgraded the pcb, power switch, and retainer.Preventative maintenance was then performed.The device subsequently passed functional testing.
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