LG Refrigerator er-dh error code
The fridge started a defrost cycle, but the defrost sensor never got warm enough (46°F) within an hour. The defrost heater is likely not heating.
Also shown as: er-dh, ER-DH, Er dH, er dh
Last updated: October 6, 2026
What causes the er-dh error?
- Failed defrost heater
- Failed defrost sensor or thermostat
- Blown thermal fuse
- Evaporator coils buried in ice
- Failed heater relay on the control board
How to fix LG er-dh — step by step
Work through these in order, from simplest and safest first. Stop as soon as the code clears.
- Power reset the fridge
Unplug the fridge for 10 minutes, then plug it back in. If the code was a one-time sensor misread, it may clear. - Do a manual defrost
Move food to a cooler, unplug the fridge, and leave the doors open for 8 to 12 hours so all ice melts. This clears the code temporarily and confirms ice was the issue.Safety warning: Never chip ice off coils with a knife or sharp tool. You can puncture the refrigerant lines. - Check the defrost drain
While defrosting, make sure the defrost drain hole inside the freezer is not clogged. A blocked drain refreezes and brings the problem back.
When to call a technician
- The code returns after a manual defrost
- Thick frost keeps building up on the back wall
- The fridge section is warming while the freezer seems fine
- You see a visibly broken heater or burnt wiring
Frequently asked questions
Why does Er dH keep coming back after defrosting?
Manual defrosting melts the ice but does not fix a dead heater or sensor. If it returns, the heater circuit needs repair.
Can a bad defrost heater ruin my food?
Yes. Without defrosting, ice chokes the coils and the fridge section slowly warms up even though the freezer feels cold.
How long does a manual defrost take?
Plan 8 to 12 hours with the doors open. Towels on the floor catch the melt water.
Sources
Every meaning and fix above was checked against official manufacturer documentation:
FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.