Hisense Defrost System Failure

Ice buildup on the back wall of the freezer, fan noise becomes loud or stops, cooling gradually worsens.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Open defrost heater, Failed defrost thermostat, Defective defrost sensor, Faulty main PCB defrost control

How to Fix / Troubleshooting

Safety: Unplug the refrigerator before defrosting or testing components.

  • 1. Perform a full manual defrost: Remove food, unplug the unit, and leave doors open until all ice melts. Use towels to catch water.
  • 2. Access evaporator components: Remove the freezer rear panel to expose the evaporator, heater, thermostat, and sensor.
  • 3. Test heater and thermostat: Use a multimeter to check continuity. Replace any open heater or thermostat.
  • 4. Test defrost sensor: Measure resistance and compare to spec. Replace if out of range.
  • 5. If all components are good: The main PCB may not be initiating defrost and may need replacement.
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Repair Difficulty

Hard 4/5

Required Part

Defrost Heater Assembly
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