(b)(4).The sample was returned for evaluation.A visual exam was performed and it was observed that the unit was severely damaged.Functional testing was also performed and the unit passed all tests.A current test could not be conducted due to an open circuit.Based on the investigation performed, the complaint of "unit will not heat" was confirmed.All aquatherm heaters are 100% tested at the manufacturing facility; therefore, any defects would be detected prior to release.Based on the functional testing results, and the damage on the heater, it was determined that the unit was overstressed during use.
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