(b)(4).The sample was returned for evaluation.A visual exam was performed and no defects were observed.Functional testing was performed and the unit passed the tests; however, the current test was not able to be conducted as the thermal cutoff was detected open and the unit did not heat up.It is possible that this damage was due to overheating of the unit.Based on the investigation performed, the reported complaint of "unit will not heat" was confirmed.Although the product showed the defect, a corrective action could not be established due to the fact that all aquatherm heaters are 100% tested at the manufacturing facility; therefore, a defect of this type would be detected prior to release.A conclusion code could not be chosen as the complaint was confirmed; however, a root cause was not established.
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