Montpellier Defrost System Failure

Freezer interior warm, compressor runs continuously, heavy ice build-up on rear panel or evaporator

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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

Burnt-out defrost heater, Failed defrost thermostat or thermal fuse, Faulty defrost sensor, Defective defrost control on main PCB

How to Fix / Troubleshooting

Safety: Unplug the freezer. Water from melting ice can create slip and shock hazards; use towels and containers.

  • Manual defrost: Remove food to a cool box. Open the door and place towels and bowls of hot water inside to melt ice. Do not use knives or heat guns.
  • Access evaporator: Remove the inner rear panel to expose the evaporator, heater, and defrost components.
  • Test defrost heater: Disconnect heater leads and measure resistance. Replace if open circuit.
  • Check defrost thermostat/fuse: Test for continuity at freezer temperature. Replace if open.
  • Inspect defrost sensor: Test NTC resistance and replace if faulty.

If all defrost components test good, the main control board may not be initiating defrost cycles and should be checked or replaced by a professional.

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Repair Difficulty

Hard 4/5

Required Part

Defrost Heater
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