The dH error on an LG refrigerator indicates a defrost heater failure. The evaporator heater can no longer melt frost off the evaporator coils during defrost cycles. Ice builds up, blocks airflow, and the refrigerator section stops cooling — usually within 24–48 hours of the error appearing. Repair cost in Denver: $150–$250. This is a time-sensitive repair. Here is what the code means and what to expect from the fix.
What the dH Code Means
LG displays “dH” (defrost heater) on the control panel when the board detects that the defrost heater circuit is open — meaning the heater wire has burned out or broken and no current is flowing through it. The board monitors defrost cycle completion through the defrost thermostat; when the heater fails, the coils never warm up and the thermostat never signals completion. After a set number of failed defrost cycles, the error is logged and displayed.
Unlike some error codes that can be cleared with a power cycle, the dH code will return immediately after restarting because the underlying hardware failure is still present. Do not attempt to run the refrigerator in a forced-defrost mode hoping to clear the code — the heater element itself must be replaced.
LG’s Defrost System Explained
LG frost-free refrigerators run an automatic defrost cycle approximately every 8–12 hours. During this cycle, the compressor and evaporator fan both stop. A glass or metal heater element mounted on or near the evaporator coil assembly is energized and warms up to roughly 50°F (10°C). This controlled warming melts any frost that accumulated on the coils during the previous cooling period. Once the defrost thermostat (a bimetal safety switch) senses the coils have reached the target temperature, it cuts power to the heater, and the compressor restarts.
This cycle happens silently in the background and is why modern frost-free refrigerators never need manual defrosting. When the heater element fails, frost is never removed and the entire coil surface eventually becomes a solid block of ice. The evaporator fan continues running but can no longer push cold air through the ice-blocked coils.
The dH Error vs. the rH Error
LG uses two closely related defrost error codes that are worth distinguishing. The dH code indicates a defrost heater circuit fault — the heater element itself or its wiring has an open circuit. The rH code indicates a refrigerator defrost sensor fault — the thermistor that monitors the refrigerator compartment during defrost has failed or is reading out of range.
In practice, these codes often appear together on the same service call. When I see a dH code, I always test the defrost thermostat and the rH sensor in the same visit, because when the heater fails and ice builds up heavily, the sensor can be damaged by the ice pressure or by freezing moisture. Replacing both components during the same visit costs less in total labor than two separate calls, and it prevents the frustrating situation of one code returning shortly after fixing the other. Cost for both together: $220–$380 in Denver. For LG refrigerator repair in Denver, I carry both parts on the truck.
LG Models That Show dH
The dH defrost heater error code appears across LG’s French Door and Side-by-Side refrigerator lines. Common model numbers include LRFXS2503, LRMVS3006, LRFXC2416, LRFOS2503, and models in the LFX and LFXS series. If your model number starts with LRF, LRFX, or LFX, the defrost system described above applies. The physical repair procedure varies slightly between French Door two-door and three-door configurations, but the components and cost are consistent.
What Happens Without Repair
The dH error demands prompt attention for the same reason as the Samsung 22E code: the consequences of waiting escalate quickly. Without functioning defrost cycles, frost builds up on the evaporator at several millimeters per day. Within 2–4 days of the code appearing, the ice buildup is typically thick enough to significantly reduce airflow to the refrigerator section. Within 3–7 days, airflow is often completely blocked.
Once the refrigerator section warms above 40°F, the USDA considers perishable food unsafe after 4 hours. If your LG refrigerator is showing dH and the fridge section feels warmer than usual or the compressor is running almost continuously, do not wait — book the repair today. A temporary workaround is to unplug the refrigerator for 24–48 hours with the doors open to manually defrost the coils, which will restore cooling temporarily while you wait for parts or an appointment. However, the heater must be replaced or the ice will return within days.
What the Repair Costs in Denver
| Service | Cost |
|---|---|
| dH diagnostic visit | $75 (waived if I do the repair) |
| Defrost heater replacement (parts + labor) | $150–$250 |
| Defrost thermostat / rH sensor (parts + labor) | $120–$200 |
| Heater + thermostat together (parts + labor) | $220–$380 |
LG showing dH and the fridge section is warming up? Act today to protect your food. I carry LG OEM defrost heaters and can complete most LG refrigerator repairs same-day in Denver.
Call Victor — Same-Day LG Refrigerator Repair in Denver
I’m Victor, the technician and owner of Easy Appliances Repair. LG defrost heater failures are among the most common refrigerator repairs I handle in Denver. I stock OEM heater elements and defrost thermostats for the most common LG French Door models and can typically complete the repair the same day I visit. Call (720) 447-8577 or book LG refrigerator repair online. Every repair includes a 1-year warranty on parts and labor.
