The manufacturer is reporting the following complaint after a voluntary review of all complaints (reportable or not) since 2016.This report is being filed now, after being scrutinized under a newly revised risk matrix, recently adopted after inspection.Cardioquip found the source of the smoke was a melted heater chamber.A bad water level sensor was suspected, but was found to be functioning correctly.After further investigation, the engineer concluded the device had been drained completely of water but still contained the frozen ice block.The ice block was sensed, as water and allowed the device to enter defrost mode.The device activated the "defrost mode" normally but with no water the heaters began to overheat the plastic material of the heater chamber.The material around the heater ports began to melt and generate smoke.All non functioning components were replaced, an inspection was performed, and the unit was fully functional.
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