| 摘要 |
An ice making tray in a refrigerator is connected by a pump to a water reservoir located in the refrigerator. Once ice has been ejected from the tray and into a bin, the pump is activated for a preset period to re-fill the ice tray with water from the reservoir. Each time that the pump is activated, its time period of operation is automatically counted, and a running total of the counted time periods is automatically kept. That total is compared to a predetermined (reference) value representing a period of pump operation which causes the water in the tank to be reduced to a predetermined low level. When the running total reaches the reference value, an alarm is energized to warn a user that the reservoir should be re-filled.
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