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Error code reference

LG Refrigerator Error Code dH F

Poor defrosting error; during 2 consecutive cycles the defrosting sensor did not reach over 46°F (8°C)

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What the dH F error code actually means

Your LG refrigerator is showing this error because the freezer's automatic defrost system failed to melt ice properly during two back-to-back defrost cycles. Something in the defrost system, such as a blown fuse, a burned-out heating element, or a bad door seal, is preventing the unit from clearing frost off the evaporator coils. Until this is repaired, the refrigerator will not cool efficiently and frost buildup will continue to worsen.

Diagnostic procedure

The full dH F procedure

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1
First diagnostic step
Check the door gasket for damage, then check the defrost control part (Fuse-M and defrost heater resistance).
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Most common causes of dH F

Ranked by how often they cause this code
  1. 1Failed Defrost Heater
  2. 2Blown Thermal Fuse (Fuse-M)
  3. 3Faulty Heater Relay
  4. 4Damaged Door Gasket
  5. 5Clogged or Frozen Defrost Drain

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Questions people ask about dH F

What does dH F mean on a LG refrigerator?
The dH F code means the refrigerator detected a poor defrost condition. During two consecutive defrost cycles, the defrost sensor never reached the required threshold of 46°F (8°C), indicating the defrost heater is not functioning properly. Common causes include a blown thermal fuse, a failed heater, a bad heater relay, or a damaged door gasket allowing excessive frost buildup.
Will resetting the refrigerator clear the dH F error code?
A power reset may temporarily clear the code from the display, but it will not resolve the underlying problem. Because the error is triggered after two consecutive failed defrost cycles, the code will return as soon as the defrost system fails again. The root cause must be diagnosed and repaired to permanently clear the error.
How much does it cost to repair the dH F error on an LG refrigerator?
Repair costs vary depending on which component has failed. A replacement thermal fuse or defrost heater typically ranges from $15 to $60 for the part alone. A door gasket replacement can range from $30 to $100 for the part depending on the model. If the control board needs replacement, costs can range from $100 to $300 or more for the part, plus labor if a technician is involved.
Can I fix the dH F error myself, or do I need a technician?
Some steps, like inspecting and replacing a damaged door gasket or clearing a frozen defrost drain, are manageable for a knowledgeable DIYer. Testing the defrost heater resistance and the Fuse-M continuity requires a multimeter and comfort working around refrigerator electrical components. Replacing the control board relay or the heater itself is more involved and may warrant a qualified technician.
Is it safe to keep using the refrigerator while it shows dH F?
Continued use with an active dH F error is not recommended. Frost will continue to accumulate on the evaporator coil, progressively reducing cooling performance and eventually blocking airflow entirely. This can lead to food spoilage in both the freezer and fresh food compartments. Addressing the error promptly prevents further damage to the appliance.

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