Owner’s manual
Error Codes
What does DHF mean on an LG refrigerator?
On the LG LFX25976SB refrigerator, DHF means the refrigerator is detecting a defrost heater failure (a defrost system problem). When the defrost cycle cannot melt frost off the evaporator, airflow gets restricted and cooling performance drops until the issue is corrected.
- Power reset: Unplug the refrigerator (or turn off the breaker) for 5 minutes, then restore power.
- Look for symptoms: Heavy frost on the back wall inside the freezer, warmer fresh food section, or reduced airflow.
- Confirm doors are sealing: A door left ajar can create excess frost; the door alarm should sound if a door is open too long.
- Setpoints: Verify your temperature settings on the display are reasonable for normal operation.
- Give it time: After any reset or setting change, allow 24 hours for temperatures to stabilize.
| Likely cause | What you may notice | Typical fix |
|---|---|---|
| Frost buildup from a defrost problem | Freezer frosts over, weak airflow | Diagnose defrost circuit components |
| Temperature sensing issue | Temps swing, defrost timing seems off | Check sensor and wiring |
| Control not running defrost correctly | Error returns after reset | Control diagnosis by a technician |
We see DHF-related cooling issues tied to the defrost system and temperature sensing. For this model, a common related component to check is the thermistor-style sensor assembly: refrigerator temperature sensor and cover ACQ73244001.
If the refrigerator is not cooling and you also hear unusual fan noise or no airflow, the evaporator fan circuit can be involved as well; how to fix your evaporator cooling fan helps you understand the symptoms and next steps.
A defrost failure lets frost build up on the evaporator coil, which blocks airflow. That can make the refrigerator section warm up even if the freezer still seems cold, and it can force the compressor to run longer than normal.
Use the LFX25976SB manual for the display indicators, temperature setting guidance, and troubleshooting steps that match your exact control panel.
Last updated: January 2026
What is the most common problem with an LG refrigerator?
For the LG LFX25976SB refrigerator, the most common customer-reported issue is a cooling problem, where the refrigerator or freezer stops holding temperature. In many cases, the root cause is in the sealed cooling system (such as the compressor), but airflow, defrost, or ice maker related issues can create similar symptoms; use the LFX25976SB manual troubleshooting section to narrow it down.
- Confirm the controls are set correctly and not turned off.
- Make sure the unit has power and the outlet is firmly connected.
- Allow time after a power outage or unplugging; temperatures can take hours to stabilize.
- Check for blocked vents from overpacked food (poor airflow mimics “not cooling”).
- Listen for fan noise inside; a failed evaporator fan can cause warm temps.
- Look for frost buildup on the back wall of the freezer (defrost issue clue).
| Symptom you notice | Most likely area | Typical next step |
|---|---|---|
| Both sections warm, little to no compressor activity | Controls, power, control board | Verify settings and power; then diagnose control circuit |
| Both sections warm, compressor runs a lot | Sealed system, condenser airflow | Clean airflow paths; if still warm, sealed system diagnosis |
| Freezer cold, fridge warm | Airflow/evaporator fan/ducting | Check fan operation and air passages |
| Ice maker stops and temps drift | Freezer temp, water supply, ice system | Confirm freezer temp first; then inspect ice system |
If basic checks point to a specific failure, these model-matched parts are often involved:
- Refrigerator compressor TCA36411702 (sealed system cooling)
- LG refrigerator evaporator fan motor 4681JB1027C (air circulation)
- LG refrigerator water inlet valve AJU72992601 (ice maker and dispenser water supply)
- Refrigerator ice maker assembly AEQ73110205 (no ice or poor ice production)
A true cooling failure can lead to food spoilage quickly, while an airflow or defrost problem can look like “compressor failure” but is often cheaper and faster to fix. Using the model-specific troubleshooting steps helps prevent replacing the wrong part.
Related help: LG bottom freezer refrigerator error codes
Last updated: January 2026
Why does ice build up in the bottom of my LG refrigerator?
Ice building up at the bottom of your LG LFX25976SB refrigerator (often under the lower drawer) is usually caused by defrost water not draining correctly; the water refreezes and forms a sheet of ice. The most common fix is clearing the defrost drain path and making sure meltwater can flow freely to the drain pan.
- A clogged or frozen defrost drain (food debris, ice, or sludge blocking the drain)
- A drain tube that is restricted, kinked, or not seated correctly
- Warm, humid air leaking in (door not closing fully, gasket not sealing), which increases frost and meltwater
- Heavy frost buildup from frequent door openings or a door left ajar
- Unplug the refrigerator and remove items from the bottom area.
- Melt the ice with the doors open; use towels to catch water (avoid sharp tools that can puncture liners).
- Clear the drain opening in the freezer/rear floor area using warm water (a turkey baster works well).
- Flush the drain tube until you can confirm water flows to the drain pan.
- Check door closing and sealing so humid air is not feeding the frost problem.
If you need the replacement drain component for this model, the refrigerator drain tube 5251JA3003D is a common part involved in drain flow issues.
| What you see | Most likely cause | What to do first |
|---|---|---|
| Solid ice sheet under bottom drawer | Drain frozen or clogged | Thaw and flush drain with warm water |
| Water puddles that later freeze | Partial drain restriction | Flush drain tube; check for kinks |
| Frost everywhere plus bottom ice | Door leak or door left open | Inspect gasket, alignment, and door closing |
| Repeats every few days | Drain refreezing | Ensure drain is fully clear and flowing strongly |
When defrost water cannot drain, it refreezes and can eventually block airflow, reduce cooling performance, and cause recurring leaks. Keeping the drain clear helps the defrost system work normally and prevents repeat ice buildup.
- Use the LFX25976SB manual for drawer removal, feature locations, and care and cleaning guidance.
- For water-related leak prevention tips that also apply to drain issues, see how to get rid of refrigerator puddles.
Last updated: January 2026
