LG Refrigerator Er dH – How to Fix, Causes & Cost (2026)

Quick Power Cycle

The first thing to try when an LG refrigerator flashes Er dH is a simple power cycle. Unplug the appliance or turn off the dedicated breaker for a full two minutes. This resets the main control board and can clear transient faults caused by a momentary voltage dip. After you restore power, watch the display for the error code. If it disappears, you’ve solved a one‑off glitch. If the code returns, the hardware needs attention.

What Triggers the Er dH Code

Understanding why the defrost heater circuit fails helps you target the right component.

• Heater element burnout – Repeated heating cycles can cause the thin coil to break or short, stopping current flow.
• Defrost thermostat failure – When the thermostat sticks open, the heater never receives power, prompting the board to flag a fault.
• Corroded or loose wiring – Moisture inside the freezer can oxidize connector pins or crack insulation, creating intermittent resistance.
• Control board misinterpretation – A rare board fault may falsely report a heater problem.
• Blocked airflow – Excess frost insulates the heater, preventing it from reaching the required temperature and causing the board to assume a circuit fault.

Detailed Repair Procedure

All steps assume the refrigerator is unplugged for safety. Wear insulated gloves and keep a dry work area.

1. Power cycle the refrigerator

Unplug the unit or switch off the circuit breaker for at least two minutes. This clears any temporary glitches in the control board. After restoring power, observe whether the Er dH code disappears. If it returns, move to the next step.

2. Locate the defrost heater and thermostat

Remove the rear freezer panel using a Phillips #2 screwdriver. The heater is a thin metal strip wrapping the evaporator coil; the thermostat is a small disc mounted nearby. Take a photo of the wiring layout before disconnecting anything. This visual aid speeds up re‑assembly.

3. Test heater continuity with a multimeter

Set your digital multimeter to the resistance (Ω) mode. Place one probe on each heater connector pin. A healthy heater typically reads 0.1–0.3 Ω (almost a short). An infinite reading or a value above 1 Ω indicates an open circuit, meaning the heater is bad and must be replaced.

4. Verify the defrost thermostat

Disconnect the two thermostat leads and measure resistance across them. When the thermostat is cold, it should read near 0 Ω; when warmed (use a hair dryer), it should increase to several hundred ohms. If the reading never changes, the thermostat is stuck open and should be swapped.

5. Inspect wiring harnesses and connectors

Visually examine all wires leading to the heater and thermostat. Look for exposed copper, cracked insulation, or corrosion on pins. Gently tug each wire; any looseness or fraying requires repair with electrical tape or heat‑shrink tubing. Faulty wiring can mimic a heater failure.

6. Replace the defrost heater (if needed)

Remove the mounting clips with a T15 Torx screwdriver and pull the heater out of the coil. Disconnect the wiring harness, install the new heater by reversing the removal steps, and ensure the connector snaps firmly. Handle the new element carefully to avoid bending the thin heating wire.

7. Replace the defrost thermostat (optional)

Some models ship with a replace‑only thermostat kit. If the thermostat failed the continuity test, remove it by pulling the two wires and unscrewing the mounting bracket. Install the new thermostat, reconnect the wires, and tighten the bracket.

8. Re‑install the rear panel and run a test cycle

Screw the rear panel back into place with the Phillips #2 screwdriver. Plug the refrigerator back in, set the temperature controls to normal, and allow the unit to run for at least two hours. The control board should initiate a defrost cycle; you’ll hear the heater energize briefly. Verify that the Er dH code no longer appears and that frost does not accumulate.

9. Reset the error code on the control board (model‑specific)

Press and hold the “Power Freeze” and “Power Cool” buttons together for five seconds. Release the buttons; the display should clear and show “‑‑”. If this combination does not work, consult the user manual for your exact model.

Pro tip: Keep a notebook of the resistance values you measured. If the same error recurs later, you can compare new readings to past data, speeding up future diagnostics.

Repair Cost Estimate

If you perform the repair yourself, the parts cost alone is usually under $100. Professional service adds labor, but many homeowners find the DIY route faster and cheaper, especially when the fault is limited to the heater element.

Warranty & Support

LG offers a limited warranty on most refrigerator components for 12 months from the date of purchase. For warranty coverage, you’ll need the original receipt and the model serial number. Contact LG Customer Care at 1‑800‑243‑0000 (available 7 days a week). When you call, have the following information ready:

• Model number (e.g., LFXS26973S)
• Serial number
• Description of the error (Er dH)
• Steps you’ve already taken (power cycle, continuity test)

If your unit is still under warranty, LG may dispatch a certified technician at no charge. Otherwise, the repair cost estimate above applies.

Preventive Maintenance Tips

• Clean the freezer coil at least twice a year. Frost buildup reduces heater efficiency and can trigger the Er dH code.
• Inspect door seals for gaps. Warm air entering the freezer forces the defrost system to work harder, accelerating heater wear.
• Run a manual defrost every six months if your model allows it. Consult the user manual for the exact button combination.
• Check wiring during routine cleaning. Look for any signs of corrosion or wear, especially around the rear panel where moisture can settle.
• Keep the condenser coils free of dust. Overheating the compressor can indirectly stress the defrost circuit.

By staying on top of these chores, you’ll extend the life of the defrost heater and keep your LG refrigerator running smoothly.

Frequently Asked Questions

Q: How long does a defrost cycle normally last? A: Most LG models run a defrost cycle for 10–15 minutes, during which the heater warms for a few seconds before shutting off.

Q: My refrigerator still shows frost after I replaced the heater. What next? A: Verify that the defrost thermostat is functioning and that the wiring is solid. If both test good, the control board may need replacement.

Q: Can I use a universal defrost heater? A: It’s best to use an LG‑specific part to ensure correct voltage and physical fit. Universal heaters may have different resistance values and can cause new errors.

Q: Is the Er dH code the same as a “defrost timer” error? A: No. The timer (or electronic control) simply schedules the cycle; Er dH specifically points to the heater circuit itself.

Q: Will a power surge cause Er dH? A: A surge can damage the heater or thermostat, but it more commonly harms the control board. If you suspect a surge, have the board inspected.

Related Error Codes

If you encounter other LG refrigerator alerts, the troubleshooting steps are often similar:

• Er CF – Control board detects a cooling fan issue.
• Er FF – Freezer fan motor malfunction.

Read more about those codes on our site: LG Refrigerator Error Er CF, LG Refrigerator Error Er FF.

Other Appliance Guides You Might Need

• For a dishwasher that won’t drain, see our guide to Bosch Dishwasher Error E01.
• If you’re dealing with a heating‑element fault in a dishwasher, the troubleshooting steps for Bosch Dishwasher Error E14 are also relevant.

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