LG Freezer DH Error: Defrost heater fault
LG freezer error — here’s what you need to know. The DH error code on your LG freezer indicates a defrost heater fault. This is a High severity issue. What Does DH Mean on an LG Freezer? The DH code means the automatic defrost system has detected a failure in the defrost heater circuit. The […]
~30%
DIY Fixable
From 30
Typical Repair Cost
1–3 hours
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Without automatic defrost, frost will continue to accumulate until the evaporator is completely blocked. The freezer will eventually fail to maintain safe temperatures, putting stored food at risk
Can I reset the code?
Yes. A power cycle will temporarily clear the code from the display, but since the defrost heater circuit is physically broken the fault will return at the next scheduled defrost cycle. Manual defrost does not fix the underlying component failure
When to stop immediately?
Stop if you notice: Frost layer is thicker than 1/4 inch on the evaporator or rear wall, Freezer temperature is rising despite the compressor running.
Symptoms You May Notice
Heavy frost buildup on evaporator coils or rear wall
Without working defrost cycles, frost accumulates rapidly on the evaporator coils and interior rear wall, eventually becoming a thick sheet of ice
Freezer gradually loses cooling ability
As frost blocks the evaporator coils, airflow decreases and the freezer struggles to maintain set temperature even with the compressor running
DH code on the control panel display
The DH fault code appears on the display, typically after the control board has attempted and failed to complete a defrost cycle
Ice buildup inside the unit
Frost or ice accumulates on interior walls or around components because the defrost cycle cannot complete, restricting airflow and reducing efficiency.
Possible Causes
Burned-out defrost heater element
The resistive heater element has open-circuited due to age or repeated thermal stress, breaking the defrost circuit
Requires ProfessionalBlown defrost thermal fuse
The one-shot thermal fuse has blown due to a defrost overtemperature event, permanently opening the heater circuit as a safety measure
Requires ProfessionalFaulty defrost thermostat
The defrost thermostat contacts have failed open, preventing current from reaching the heater even though the element and fuse are intact
Requires ProfessionalSafe Checks You Can Do
-
1
Perform a manual defrost
Unplug the freezer and let it defrost with the door open for 24–48 hours. This will not fix the DH fault but will clear accumulated frost and allow you to assess the extent of the buildup
-
2
Reset the unit after manual defrost
After the freezer is fully defrosted and dried, plug it back in and check if the DH code is still displayed. A single cleared defrost can sometimes reset a marginal thermostat contact
-
3
Visually inspect the defrost heater
With the unit unplugged, remove the rear interior evaporator panel. Look at the glass defrost heater for dark spots, cracks, or a broken element — visible damage confirms a failed heater
When to Call a Professional
Contact a qualified technician if:
- Defrost heater shows an open circuit when tested with a multimeter — element replacement required
- Thermal fuse tests open — must be replaced and the root overtemperature cause identified
- Heater and fuse test good but defrost still fails — control board or defrost thermostat at fault
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
Freezer Repair Service Schedule Appointment