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Sharp H21: Operational cycle fault detected during Refrigerator / Freezer program execution.
The ice maker cycle is not completing correctly, indicating a mechanical or sensor failure within the ice maker unit.
Check for jammed ice cubes. Ensure water is supplied to the ice maker. Reset the ice maker. If the problem continues, replace the ice maker assembly.
Sharp H27: Motor drive or inverter rotation anomaly in Refrigerator / Freezer; drum/motor fails to spin at target RPM.
The damper, which controls airflow between the freezer and refrigerator compartments, is stuck or its motor has failed.
Inspect the damper for ice blockages. Listen for the motor sound during operation. Test the damper motor and switch, and replace the assembly if faulty.
Sharp H28: Operational cycle fault detected during Refrigerator / Freezer program execution.
The control board has detected a fault with one of the door switches, or a door has been left open for an extended period.
Ensure all doors are fully closed. Check the door switches for physical damage or obstruction. Test the switches for proper operation.
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