LG Refrigerator DH Error Code: Meaning, Causes & Fix
Defrosting failure — the refrigerator has failed to defrost properly (displayed F dH for the freezer side, r dH for the refrigerator side, or Er dH).
DH (Er dH; F dH / r dH by compartment) reports a defrosting failure: LG's definition is that the normal compartment temperature is not detected even after a set time has elapsed since defrosting started — its video guidance puts that at more than an hour spent trying to defrost without reaching the preset temperature. LG's listed causes are wider than the heater alone: ice accumulation, a blocked drainage hole, temperature fuse disconnection, heater disconnection, or main PCB failure. The slow-motion symptoms precede the code: freezer rear panel frosting over, fan noises (blades nicking ice), temperatures creeping up over one to three weeks. DH becomes clearer once you see that LG defines it by time and temperature, not by a broken part. The defrost system is a timed negotiation: the heater works to raise the evaporator to a preset temperature, the control watches for the compartment's normal temperature signature afterwards, and dH is displayed when that signature does not arrive within the allowed period — about an hour in LG's video guidance. Anything that breaks the negotiation qualifies, which is why LG's cause list mixes the electrical (fuse disconnected, heater disconnected, main PCB failure) with the purely physical (ice accumulation, a drainage hole blocked with ice). A refrigerator can therefore earn dH with every electrical component healthy, simply by carrying more frost than one defrost can clear or by refreezing its own melt water. That breadth is the reason LG's remedies escalate from a two-minute reset to a full manual defrost before any part is condemned: the cheap explanations are physical, and they are common.
What causes the DH code on a LG refrigerator?
Ice accumulation with a blocked drainage hole
An LG-listed cause in its own right: melt water that cannot reach the drain tray refreezes, the compartment temperature never registers as defrosted, and dH is displayed even with a working heater.
Defrost heater failure
The heater element opens with age/thermal cycling (LG lists heater disconnection among the dH causes).
Thermal fuse blown
The one-shot safety in the heater circuit opens (after a genuine overheat or by fatigue) — LG lists temperature fuse disconnection explicitly.
Defrost sensor fault
The control can't judge defrost and aborts it (see the sensor family — F5/rS renderings).
Board defrost output failure
The relay that feeds the heater stops switching.
Melt water with nowhere to go: the blocked drainage hole
LG's F dH guidance lists a blocked drainage hole among this error's causes in its own right, and the mechanism is self-reinforcing. During defrost the heater melts frost from the coil and the water should run to the drain tray; if the drainage hole is choked with ice, that water pools and refreezes instead, the compartment temperature never registers the way the control expects after defrosting starts, and dH is displayed. Every subsequent defrost adds more water to the same frozen plug, which is why a drain-blocked dH survives heater tests that come back perfectly healthy.
A temperature fuse or heater connection that has opened
LG names temperature fuse disconnection and heater disconnection explicitly among the F dH causes, alongside main PCB failure. The fuse is a one-shot safety device in the heater circuit: once it opens — from a genuine overheat event or from age and thermal cycling — no defrost heat is produced at all, however healthy the heater element itself remains. The same is true of a heater whose connector has worked loose or corroded open. Both faults present identically (defrost attempted, temperature never rises, dH displayed), which is why LG groups them and why the circuit is tested as a chain rather than part by part.
Frost loading so heavy the defrost cannot finish in its window
LG's video guidance defines the trigger precisely: the defrost heater raises the evaporator temperature to a preset limit, but if that preset temperature is not reached within one hour, the dH code appears, indicating most likely a significant amount of frost buildup. A refrigerator breathing moist air through a torn gasket, propped door or blocked vents can accumulate frost faster than one defrost cycle clears it — the heater works correctly throughout, simply outnumbered, and dH reports an unfinished job rather than a dead component.
Checks to run before you replace anything
- Confirm the frost pattern: a uniformly frosted-over evaporator/rear panel (vs. a corner-only pattern, which suggests refrigerant issues instead).
- Meter the heater for continuity (unplug; access behind the freezer rear panel after manual defrost): open = failed.
- Meter the thermal fuse for continuity: open = blown (and ask why).
- Identify which compartment is complaining before anything else: LG explains the dH family displays in three variations depending on the model — F dH, r dH, or Er dH. The prefix is information: F dH concerns freezer defrosting and r dH refrigerator defrosting, so the letter tells you which evaporator's defrost has failed and keeps you from stripping the wrong compartment looking for frost.
- Apply LG's two-minute reset as a genuine test, not a ritual: unplug the refrigerator or trip its breaker for two minutes, restore power, and let the system attempt defrosting again, exactly as LG's dH video prescribes. Then wait and watch — LG states that if the dH code reappears after about an hour, the frost buildup on the evaporator is still significant. A code that returns on that one-hour schedule has told you the defrost is being attempted and is failing to complete.
- Do the prevention audit LG lists while the refrigerator is accessible: confirm the vents inside the refrigerator are not blocked by food, that the refrigerator and freezer doors are properly levelled and aligned and close completely, and — on French Door units — run a hand along the door gasket checking for tears or damage. Each of those is a frost supply line, and LG publishes them as the checks that stop dH recurring after the immediate fault is cleared.
- Estimate the frost burden from the symptoms before committing to a defrost duration: a rear freezer panel that is merely cold and white is a different job from one that bulges, crackles, or has frost spilling from its edges, and a freezer fan starting to tick against ice confirms the burden is mechanical as well as thermal. Heavy burdens follow LG's longer melt guidance; light ones clear within its eight-hour minimum manual defrost.
How to fix dh error code lg refrigerator?
- Full manual defrost before any panel work — you cannot service a coil buried in ice.
- Replace the failed component (heater, fuse, sensor) found by metering.
- Board output diagnosis last, by a technician, if all components meter good.
- When the two-minute reset fails and dH returns, move to LG's manual defrost in full: unplug the refrigerator, remove all food and empty the ice bin, leave it unplugged with its doors open for at least eight hours, keep towels in and around the unit for the melt water, dry the interior with a towel afterwards, then close the doors, plug back in and allow 24 to 48 hours for normal operation to settle before judging the result.
- Where the drainage hole is the suspect, give the melt time to finish the whole journey: LG's F dH page explains that once the ice has melted completely, the water should run out normally to the drain tray — and it allows a day in summer and three days in winter where ice is blocking the drainage path. Ending the defrost early because the coil looks clear, while the drain is still frozen shut, leaves the root cause in place and dH returns on the next defrost cycle.
- Fix the frost supply in the same visit: clear blocked interior vents, realign or re-level doors that do not close completely, and have a torn French Door gasket replaced. LG lists these as its prevention steps for this exact error, because a defrost system repaired into a refrigerator that keeps admitting moist air will be overwhelmed again no matter how healthy its heater is.
- If dH repeats after a complete manual defrost on a refrigerator whose vents, doors and gaskets all pass, stop repeating defrosts and request service, as LG directs for a repeated inspection code: the remaining causes on LG's own list — temperature fuse disconnection, heater disconnection, main PCB failure — are circuit faults that melting cannot reach, and each further week of frost growth strains the compressor and the freezer fan in the meantime.
The part that usually fails: Defrost heater / thermal fuse / defrost sensor (the defrost circuit)
Meter all three in one access session — they're neighbours, and replacing one at a time across repeat defrosts wastes weeks.
How to reset / clear the DH code
Power-cycle after repair and defrost; DH clears when a defrost cycle completes with normal sensor behaviour.
LG refrigerator error codes (the Er family) clear with a power reset: unplug for about 5 minutes (or hold the control's reset where fitted) and restore power. Fan and sensor codes that return after the reset are active faults — the board re-tests fans and thermistors continuously. Note that after any reset the cabinet needs several hours to pull temperatures back down, so judge the result by whether the code returns, not by instant cooling.
Why does the DH code keep coming back?
DH returning within a month means a circuit member was missed (often the sensor drifting) or the board's defrost timing is at fault. Read DH's return interval as its diagnosis. A code that reappears about an hour after the reset has failed a live defrost attempt — think heater circuit or an overwhelming frost burden. A code that stays away for days after a thorough manual defrost, then returns, describes frost regrowing at its normal pace, which points back at air ingress: vents, door alignment, gasket condition, and the drainage hole's freedom to carry melt water away. A code that returns within weeks despite a sealed cabinet and a clear drain has exhausted the physical explanations on LG's list, leaving its electrical trio — temperature fuse, heater connection, main PCB — for the service diagnosis LG prescribes. In all three stories, letting the refrigerator run frosted for weeks is the one wrong move: cooling efficiency falls daily while the compressor's workload climbs.
How to stop DH coming back
- Ice accumulation with a blocked drainage hole: An LG-listed cause in its own right: melt water that cannot reach the drain tray refreezes, the compartment temperature never registers as defrosted, and dH is displayed even with a working heater.
- Defrost heater failure: The heater element opens with age/thermal cycling (LG lists heater disconnection among the dH causes).
- Thermal fuse blown: The one-shot safety in the heater circuit opens (after a genuine overheat or by fatigue) — LG lists temperature fuse disconnection explicitly.
Retrieving stored fault codes on LG refrigerators
LG refrigerators have a test mode on the main board (a test button on the PCB steps through test 1/2/3 states: compressor and fans forced on, then defrost forced, then display test) which technicians use together with the blink pattern of the board's LED — on inverter models the LED blink count on the main PCB is itself a fault code (this is where '6 blinks' style codes come from). The board sits under the rear cover; treat it as live mains circuitry.
Other LG refrigerator error codes
| Code | Meaning | First fix |
|---|---|---|
| 1F | Ice-maker fan error (Er 1F/IF family) — the fan feeding the ice maker is not running correctly. | Defrost fully; fix the gasket leak. |
| 6 Blinks | Compressor/inverter blink code — the inverter board's LED blinking 6 times signals a compressor drive fault (communication/start failure between inverter and compressor). | Restore condenser airflow. |
| CF | Condenser fan error — displayed as Er CF / E CF (the E is the panel's error marker). LG: a CF error appears if the fan motor which disperses heat from the mechanical compartment (compressor) at the back of the refrigerator does not operate due to an abnormality. LG calls it a mechanical compartment fan motor defect error. | Clear anything physically obstructing the fan and reseat a visibly loose connector (power off throughout); retest with LG's reset and watch for the 3-hour return. |
| CH | Communication error (Er CH) — boards in the refrigerator have lost communication (grouped in the motor/drive family on this platform's code chart). | Reseat connectors; replace a movement-sensitive harness. |
| CL | Not an error on LG refrigerators — CL codes on LG laundry mean Child Lock; on fridge displays, a 'CL'-like reading is usually a status/temperature display or a mis-read. LG fridge faults use the Er code system (Er FF, Er CF, Er DH…). | Exit demo mode per the manual (button combination varies) if that's the state. |
| D5 | Defrost sensor error (Er D5 / dS family) — the defrost temperature sensor is faulty. | Full manual defrost; replace the sensor (or re-clip and clean its connector). |
| Er CF | Er CF: mechanical compartment (condenser) fan motor defect. | Unplug five minutes and retry; error returns after three hours if fault remains. |
| Er FF | Er FF: freezer fan motor does not operate normally. | Unplug five minutes and retry; if iced, defrost doors-open one day in summer. |
| Er FS | Er FS: failure of the freezer sensor (per LG refrigerator service manual defect table). | Unplug and reconnect after a few minutes; request service if it persists. |
| Er HS | Er HS: defect of the humidity sensor (per LG refrigerator error code document). | Request service; LG lists no user fix for this sensor defect. |
| Er IF | Er IF: ice maker fan problem due to frost or ice buildup (also shown as F1). | Reset two minutes; if it returns, defrost unplugged eight hours with doors open. |
| Er IS | Er IS: defect of the ice room sensor (per LG refrigerator error code document). | Request service; LG lists no user fix for this sensor defect. |
| Er SS | Er SS: defect of the pantry sensor (fold 'SS'; per LG refrigerator error code document). | Request service; LG lists no user fix for this sensor defect. |
| Er dH | Er dH: defrosting failure; normal temperature not reached after defrost started (variants F dH, r dH). | Unplug and defrost doors-open one day in summer; request service if it repeats. |
See the full list on the LG Refrigerator error codes hub.
Codes DH gets confused with
CF — Condenser fan error — displayed as Er CF / E CF (the E is the panel's error marker). LG: a CF error appears if the fan motor which disperses heat from the mechanical compartment (compressor) at the back of the refrigerator does not operate due to an abnormality. LG calls it a mechanical compartment fan motor defect error. The fan in question is the one in the machine compartment at the bottom rear of the refrigerator, beside the compressor — its job is to disperse the heat the compressor and condenser produce.
IF — Ice-maker fan error — an issue with the ice maker fan, in LG's own guidance caused by frost or ice buildup around it. Displayed as IF, IF E / E IF (Er IF) and paired by LG with F1 (read 1F on segmented displays) — all the same ice-maker fan code family. IF reports the ice-maker fan: the fan that pushes freezer air to the ice maker (in-door ice systems especially).
FF — Freezer fan error — the freezer evaporator fan motor is not running correctly (Er FF). FF (Er FF) reports the freezer fan: it circulates air over the evaporator and distributes cold to the freezer (and, via ducts, the ice maker and fridge).
F5 — Refrigerator temperature sensor error (Er F5 / rS family) — the fresh-food sensor is faulty. F5 belongs to LG's sensor family for the refrigerator compartment (rendered Er FS or rS on some platforms — F5 is the family member used in this site's system grouping): the fridge temperature sensor reads out of range, so the control can't regulate the compartment.
Frequently asked questions
How long does a manual defrost take?
LG's own dH guidance: unplug, empty the food and ice bin, leave the doors open for at least 8 hours with towels down, then restart and allow 24 to 48 hours for normal operation. Where the drain hole itself is iced over, LG's F dH page allows a full day in summer and up to three days in winter for the ice to melt through to the drain tray. Never chip ice with metal tools — a punctured coil turns a defrost job into a new fridge.
How do I fix the DH error code on an LG refrigerator?
Work LG's ladder for this code. First, unplug the refrigerator or trip its breaker for two minutes and restore power so the system can attempt defrosting again; LG notes that if dH reappears after about an hour, the frost buildup is still significant. Second, manually defrost: unplug, empty all food and the ice bin, leave the doors open at least eight hours with towels down, dry the interior, restart, and allow 24 to 48 hours for normal operation. If the same code repeats after that, LG says the refrigerator needs checking by a service technician, since its remaining listed causes are fuse, heater or main PCB faults.
What is the difference between F dH, r dH and Er DH on an LG refrigerator?
They are the same defrosting failure wearing compartment labels. LG's guidance states the dH code displays in three variations depending on the model — F dH, r dH, or Er dH — and its F dH page defines them as a freezer defrosting or refrigerator defrosting failure: the F prefix points at the freezer side and the r prefix at the refrigerator side. In every variation the underlying report is identical: defrosting started, and the expected normal temperature was not detected within the allowed time.
Why does my LG refrigerator keep showing DH after I defrosted it?
Because a manual defrost removes frost, not causes — and LG's cause list for this error includes items melting cannot cure: a temperature fuse that has disconnected, a heater that has disconnected, a main PCB failure, and a drainage hole still blocked with ice deeper than the defrost reached. There is also the supply side: vents blocked, doors not closing completely, or a torn gasket keep feeding moist air that rebuilds frost between defrosts. LG's direction when the same inspection code repeats is a service check for an accurate diagnosis.
How long has an LG refrigerator been trying to defrost when DH appears?
Just over an hour, by LG's own account. Its dH guidance explains that during the defrost cycle the built-in heater raises the evaporator temperature toward a preset limit, and if that preset temperature is not reached within one hour, the dH error code appears — most likely, LG says, because of significant frost buildup. That timing is also your diagnostic clock after a reset: a dH that reappears roughly an hour after power is restored has failed a fresh defrost attempt, not merely remembered an old one.
How to fix dh error code lg refrigerator?
Start here: Full manual defrost before any panel work — you cannot service a coil buried in ice. Replace the failed component (heater, fuse, sensor) found by metering.
Related guides
Facts on this page were checked against manufacturer documentation: www.lg.com · www.lg.com · www.lg.com · www.lg.com · www.lg.com