A sample was received to perform an investigation.An inspection of the returned device found a bent micro switch and noisy pump.Functional testing was performed by filling the tank with water, attaching the temperature check, plugging in the line cord, and turning on the power switch.The reported problem was confirmed.The pump was found to be noisy.The root cause of the problem was unable to be determined.The micro switch and pump were replaced and preventive maintenance was performed.A device history record (dhr) review was performed, and no causes or potential causes to the customer's reported problem were found.
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