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Your ice maker is designed to fill with water for 6 to 8 seconds. Depending on your city water pressure, anything longer than eight seconds will overfill the ice tray and either over flow the ice maker or create cubes that have difficulty ejecting.
There are two basic issues that commonly cause an overfill condition.
How to Diagnosis:
- The first is an ice maker that is sending power to the water inlet valve for a period longer than eight seconds.
- The next problem which is the subject of this answer is a water inlet valve that is closing too slowly. The power to the valve is being shut off in the correct amount of time, but due to imperfections in the valve, it is closing in a delayed fashion.
The easiest way to determine if your water inlet valve is the culprit, is to install a meter volt meter across the leads of the water inlet valve.
- Set the voltage range for 110v.
- Manually cycle the ice maker and watch the meter.
- When the ice maker begins to fill with water the meter will read voltage coming from the ice maker.
- Note the difference in time between when the voltage is cut from the valve and when the water quits filling the ice maker.
- If the water shuts off immediately when the voltage is removed, the valve is likely operating correctly.
- If this is the case, it is likely that the voltage will be applied to the valve for a period of time greater than eight seconds.
- This generally indicates an ice maker control problem.
However, if the voltage is removed from the valve and it continues to fill, the valve is likely at fault. This indicates that due to particle build-up or mechanical failure the valve has lost its ability to shut immediately. In that case, simply replace the valve and it should fix your problem.