A 1/2 second on, 1/2 second off blinking indicates a fault condition with the icemaker. It could be an open or shorted thermistor, or a harvest cycle taking longer than 30 minutes. Check for a stuck ejector - caused by a cube that was not cleared or a mechanical problem. Other causes can be bad icemaker heater, control board, thermal cut out, or bad motor. Essentially, if you don't have a physical blockage, you will have to replace the icemaker.
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