D4 is unknown.No product information has been provided to date.Additional information: d5, d4 catalog number this mdr was generated under protocol b10010116, as a result of warning letter cms# 617147.A product sample was received for evaluation.Visual and functional testing were performed.Wear and tear damaged enclosure and front cover.Stripped interlock block,worn and faded line cord and pole clamp.Outdated printed circuit board (pcb) and power switch.Removed front cover and started with a visual inspection.Then filled tank with water, attached temp check, plugged in line cord, and turned on the power switch.The reported problem was confirmed.The reported issue was found to be caused by malfunctioned and damaged liquid crystal display (lcd).The root cause of the reported issue was caused by user interface.The technician replaced pcb.No causes or potential causes of the customer's reported problem were found during the review of service and repair records., corrected data: corrected d1 d2 d3 d10 g1 g5 h3 and h6.
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