A steris field service technician arrived onsite, inspected the unit, and identified melted electrical and plumbing components underneath the sump.The technician's inspection determined the melted connections were most likely caused by a closed contactor which allowed for a continuous current to run through the heater element.The over-temperature switch (ots) is designed to shut down the controller and thus the heater elements de-energize.The ots had been tripped, the controller shut down, but the heater elements were still energized.Because the heater elements had not de-energized, it is most likely there was a contactor malfunction which allowed the heater element to stay in the "on" position.The unit has not been returned to service because the customer has made the decision to replace the unit.
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