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So first, your control lock is engaged which is why it's flashing and why you can't reset the filter. Try to press and hold the control lock button for 5 seconds first to unlock the control panel. Then press and hold the filter button for 5 seconds. If that doesn't work, unplug the refrigerator for 5 minutes to see if the electronics will reset. If that still doesn't work, then you need to replace the dispenser control board because it has just failed.
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