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Error code reference

LG Refrigerator Error Code dH E

Defrost Heater Error

LG codesLG refrigerator codes

Defrost Heater Error - When defrost sensor does not reach over 8°C within 1 hour; error indicated when it occurs more than twice sequentially.

First step from the service manual

Check the door gasket, then check loose connection in defrost control part connector and check resistance of defrost control part (Fuse-M and Defrost Heater).

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What dH E means on a LG refrigerator

The dH E error code on an LG refrigerator indicates a Defrost Heater Error. This fault is logged when the defrost sensor fails to reach a temperature above 8°C within a one-hour defrost cycle. The control board only confirms and displays this error after the condition occurs at least twice consecutively, which means the refrigerator has already attempted and failed multiple defrost cycles before alerting you. The defrost system is responsible for melting frost that accumulates on the evaporator coils, and when it fails, ice buildup will eventually block airflow and cause the refrigerator to lose cooling efficiency.

The defrost circuit involves several components working together: the defrost heater, the defrost sensor (thermistor), and a thermal fuse called the Fuse-M. The Fuse-M is a one-time safety cutout that opens permanently if the heater area overheats. If the Fuse-M has blown, the heater circuit is broken and no heat will be generated during defrost cycles regardless of what the control board signals. The defrost heater itself can also fail through an open coil or degraded resistance outside of its functional range.

Additional causes include poor door gasket sealing, which allows warm, humid air to enter the refrigerator compartment continuously, accelerating frost accumulation and overwhelming the defrost system. Loose or corroded connections in the defrost control circuit can also interrupt the heater circuit or cause inaccurate sensor readings. Diagnostics should begin with a visual inspection of the door gasket seal, followed by checking wiring connectors in the defrost control section, and then measuring the resistance of both the Fuse-M and the defrost heater to determine which component has failed.

Source: manufacturer service documentation.

Common causes of dH E

  1. 01

    Failed Defrost Heater

    Part replacement

    The defrost heater element can burn out or develop an open circuit, meaning no heat is produced during defrost cycles. Confirm by disconnecting power and measuring the resistance of the heater directly; an open circuit or reading far outside the expected range indicates a failed heater.

  2. 02

    Blown Fuse-M (Thermal Fuse)

    Part replacement

    The Fuse-M is a one-time thermal cutout in the defrost circuit that permanently opens if it detects excessive heat. Once blown it cannot reset, breaking the defrost heater circuit entirely. Check continuity across the Fuse-M with a multimeter; no continuity confirms it has blown and must be replaced.

  3. 03

    Loose or Corroded Connector in Defrost Control Circuit

    Wiring / connection

    A loose, corroded, or damaged wiring connector in the defrost control section can interrupt the circuit between the control board, heater, and sensor. Inspect all connectors in the defrost circuit for signs of corrosion, heat damage, or poor seating and reseat any suspect connectors.

  4. 04

    Defective Defrost Sensor (Thermistor)

    Part replacement

    If the defrost sensor is reading incorrectly, the control board may terminate the defrost cycle prematurely because it never receives a signal that 8°C has been reached, even if the heater is functioning. Check the sensor resistance against the expected value for the operating temperature.

  5. 05

    Damaged or Poorly Sealing Door Gasket

    Part replacement

    A door gasket that does not seal properly allows warm, moist air to enter the refrigerator continuously, causing excessive frost accumulation that the defrost system cannot keep up with. Inspect the gasket around the full perimeter of the door for tears, gaps, or deformation, and check that the door closes with even resistance throughout.

See the test procedure for each cause

Frequently asked questions about dH E

What does dH E mean on a LG refrigerator?
The dH E code stands for Defrost Heater Error. It means the defrost sensor did not detect a temperature above 8°C within a one-hour defrost cycle, and this failure occurred at least twice in a row. The error points to a problem in the defrost circuit, which can include the defrost heater, the thermal fuse (Fuse-M), the defrost sensor, or the wiring connecting these components. Without a functioning defrost system, ice will build up on the evaporator coils and the refrigerator will lose its ability to cool.
Can I fix the dH E error myself, or do I need a technician?
Some steps, such as inspecting the door gasket and reseating loose wiring connectors in the defrost circuit, are within reach for a knowledgeable DIYer. Testing the resistance of the Fuse-M and the defrost heater with a multimeter is also a manageable task if you are comfortable working around appliance components after disconnecting power. However, if a heater element, thermal fuse, or defrost sensor needs replacement, accurately identifying the correct part and safely accessing the evaporator compartment may warrant a professional technician, especially if you are unfamiliar with refrigerator disassembly.
Will resetting my LG refrigerator clear the dH E error?
A power reset may temporarily clear the displayed error code, but it will not fix the underlying problem. Because the dH E code only appears after the defrost failure occurs at least twice consecutively, the fault is persistent and will return after the next failed defrost cycle if the root cause is not repaired. Resetting without addressing the defrost circuit will allow continued frost accumulation and eventual cooling failure.
Is it safe to keep using my refrigerator while the dH E error is showing?
Continuing to use the refrigerator with this error active is not recommended for extended periods. Without a functioning defrost cycle, frost will build up on the evaporator coils, progressively blocking airflow and reducing cooling performance. Food safety may be compromised if the refrigerator cannot maintain proper temperatures. Address the error as soon as possible to avoid food spoilage and more extensive secondary damage to the cooling system.
How much does it cost to repair the dH E error on an LG refrigerator?
Repair costs depend on which component has failed. A thermal fuse (Fuse-M) is typically the least expensive part, with parts and labor combined often ranging from around $75 to $150. A defrost heater replacement including labor generally falls in the range of $100 to $250. If the defrost sensor or control board is involved, costs can be higher. Getting a diagnostic assessment from a qualified technician before purchasing parts is advisable to avoid replacing components that are still functional.

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