dH
LG Defrost Heater Overrun / Defrost Error

Freezer displays dH or DH; unit may stop cooling and may show extended defrost time.

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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

Defrost cycle exceeding normal time due to heavy frost, Failed defrost sensor not terminating defrost, Weak or shorted defrost heater, Control board defrost logic fault

How to Fix / Troubleshooting

Safety: Unplug the freezer before accessing internal panels.

dH indicates the defrost cycle took too long or did not complete properly.

  • Manual defrost: Empty the freezer and remove the rear interior panel. Allow all ice on the evaporator to melt completely. Use towels and a fan; do not use sharp tools or open flames.
  • Inspect defrost components: Check the defrost heater and defrost thermostat/thermistor for damage or loose wiring.
  • Test heater and thermostat: With a multimeter, verify continuity of the heater and defrost thermostat when cold. Replace any open components.
  • Check door gaskets: Ensure the freezer door seals tightly to prevent excess moisture and frost buildup.
  • Reassemble and monitor: After repairs and full defrost, reassemble panels, restore power, and monitor for recurrence of dH.

If dH returns quickly with proper defrost components, the main control board may be mismanaging defrost and should be checked by a technician.

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Repair Difficulty

Hard 4/5

Required Part

Defrost Heater Assembly
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