H6.Investigation codes: updated investigation summary: the affected device was returned for evaluation.As a result of the external appearance test, it was confirmed that there was a crack in the reservoir tank cover.No abnormality related to the reported event was confirmed on the product.Functional testing was performed.The reported event was not confirmed as the product worked properly; therefore, the root cause was not determined.It is assumed that the cause of the occurrence was that air got mixed in when connecting the heating tube l-70 to the main unit, which prevented the circulating water from circulating and caused the alarm to occur.At the customer's request, the product was returned to the customer without repair.The service history review identified there was no indication that the complaint was related to a service of the device within the review period.
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