Owner’s manual
Error Codes
What water filters are compatible with LG refrigerators?
For LG model LUPXS3186N, the compatible water filter is the one specified for that exact model in the LUPXS3186N owner's manual. On this model page, the listed replacement filter is parts assembly,ice water ADQ73613401, which is the correct match when you are replacing the filter used in the refrigerator’s filter head.
How to confirm you have the right filter
Use these quick checks before ordering:
- Match your refrigerator model number to LUPXS3186N (on the rating label inside the fresh food compartment)
- Match the old filter’s markings (part number printed on the cartridge) when available
- Confirm the filter location and style (this model uses a twist-in style filter in the filter head)
- If your filter indicator is blinking or flow is reduced, it is time to replace the cartridge
Replacement timing and what to do after you install it
LG’s guidance for this refrigerator is to replace the water filter about every 6 months, or sooner if flow drops or ice cubes get smaller.
After installing the new filter:
- Dispense and discard about 2.5 gallons of water to purge air and flush the system
- Run the dispenser in cycles (about 30 seconds on, 60 seconds off) to avoid overheating the dispenser area
- Press and hold the Water Filter button for 3 seconds to reset the filter indicator
Common symptoms and the most likely cause
| Symptom | Most likely cause | What to do |
|---|---|---|
| Slow water from dispenser | Clogged/expired filter | Replace the filter and flush 2.5 gallons |
| Small ice cubes | Restricted water flow | Replace the filter; verify supply valve is fully open |
| No water dispensing | Door open, control locked, or air in line after filter change | Close doors, unlock panel, flush water |
Why it matters
Using the correct filter for LG LUPXS3186N protects water taste and flow rate, helps the ice maker fill properly, and prevents nuisance issues like slow dispensing right after a filter change.
Last updated: February 2026
How do you reset the bottom ice maker?
On the LG LUPXS3186N bottom-mount refrigerator, we reset the ice maker by turning it OFF and back ON at the control panel (press and hold Ice On/Off for 3 seconds), then confirming the ice bin and feeler arm are seated and moving freely. See the owner's manual for the exact button location and control panel behavior.
Quick reset steps (safe and effective)
- Remove the ice bin; reinsert it carefully so it does not hit the ice maker.
- Make sure the ice compartment door closes tightly.
- Press and hold Ice On/Off for 3 seconds to turn the ice maker OFF.
- Wait 30 seconds, then press and hold Ice On/Off for 3 seconds to turn it ON.
- Check the auto shutoff (feeler arm); clear any frost or debris so it can move freely.
- Allow time for recovery: ice maker operation starts once the unit is at 15°F (-9°C) or below.
What to expect after a reset
It is normal for ice production to take time after you reset or after the refrigerator has been newly installed.
| Situation | What’s normal | What to do |
|---|---|---|
| New install or long downtime | First ice in 12 to 24 hours; full production can take up to 72 hours | Keep Ice On/Off set to ON; keep doors closed |
| Bin looks full but ice stops | Ice can mound near the sensor/feeler arm | Shake/level the bin so ice sits evenly |
| Buzzing sound | Water valve may buzz during fill | If no water is connected, turn ice maker OFF |
Why it matters
A quick OFF/ON reset clears most “no ice” situations caused by a full bin signal, a blocked feeler arm, or the ice bin not being fully seated. It also helps prevent damage when the water line is not connected or the bin is removed too long.
If it still won’t make ice
- Confirm the water supply shutoff valve is fully open.
- Replace a clogged water filter if flow is slow; use the correct parts assembly,ice water ADQ73613401.
- If the ice maker fills slowly or not at all, the LG refrigerator water inlet valve AJU72992603 is a common failure point.
- Review prevention tips in how to prevent water dispenser and ice maker problems.
Last updated: February 2026
What does DH mean on an LG thermostat?
On an LG refrigerator like model LUPXS3186N, dH typically points to a defrost heating problem: the unit started a defrost cycle but did not warm up as expected within the allowed time. This is commonly tied to the defrost heater circuit, defrost sensor, or control logic.
What dH usually indicates
In LG refrigerator diagnostics, dH is used for a defrost heat error (defrost not completing normally). In real-world troubleshooting, the most common causes are:
- Frost buildup restricting airflow because defrost is not melting ice
- A failed defrost heater or an open heater circuit
- A bad defrost sensor/thermistor reading the wrong temperature
- Wiring/connector issues in the defrost circuit
- A control board problem that is not powering the heater
For model-specific display behavior and any related indicators, check the owner's manual.
Quick checks you can do safely
Before replacing parts, we recommend these basic steps (power off the refrigerator before any inspection):
- Unplug the refrigerator for 5 minutes, then restore power and watch for the code returning
- Check for heavy frost on the rear freezer panel (a strong sign of a defrost failure)
- Confirm doors seal fully and close consistently (warm air leaks can worsen frost)
- Make sure vents are not blocked by food packages
- If the refrigerator is connected to Wi-Fi features, run any built-in diagnostics described in the manual
What to do next (repair path)
If dH returns after a reset and you see frost buildup, the repair path usually follows this order:
| Step | What you’re checking | What it tells you |
|---|---|---|
| 1 | Frost pattern and airflow | Confirms a defrost or airflow issue |
| 2 | Defrost sensor/thermistor and wiring | Confirms temperature feedback is accurate |
| 3 | Defrost heater circuit | Confirms heat is actually being produced |
| 4 | Main control output | Confirms the board is sending power during defrost |
If you need to replace electronic components, use the parts list for your model and match by model number and diagram callout. A common control-related replacement on this model is the LG refrigerator electronic control board EBR82394501 (only replace after confirming the failure).
Why it matters
A persistent dH condition can lead to heavy frost, poor cooling, warm temperatures in the fresh food section, and compressor overwork. Catching it early helps prevent food spoilage and reduces strain on the sealed system.
Last updated: February 2026
