If you are seeing this code, your appliance has likely halted mid-cycle, leaving your garments saturated and cold. You might notice a lack of heat emanating from the top panel or an unusual silence where the whirring of the drying fan should be. While this error indicates a critical system failure, it is a diagnostic signal designed to protect the unit from thermal runaway. With a systematic approach to electrical testing and component inspection, this issue is entirely resolvable by a determined DIYer or a seasoned technician.
Symptoms of a dHE Failure
The most obvious symptom is the dHE alphanumeric string flashing on the LED display, accompanied by a repetitive chime. However, physical precursors often manifest before the code hard-locks the machine. You may observe that the drying cycle runs for its full duration, yet the clothes emerge soaking wet and stone-cold, indicating the heater never energized.
🛑 Warning: Check Manual First
Incorrect repairs can cause fire or injury. Always verify with the manufacturer’s manual.
In other instances, the machine may start the drying process and then abruptly shut down after 5–10 minutes. This often points toward a “thermal trip” where the heater is working, but the blower motor has failed, causing heat to bottle up until a safety fuse cuts power. You might also notice a faint metallic burning smell or a grinding noise originating from the top-rear of the machine, which typically signals a seizing fan motor bearing or a deteriorating heating coil.
Comprehensive Repair Guide
SAFETY WARNING: Before proceeding, disconnect the power cord from the wall outlet. Testing components requires exposing live-voltage areas and sharp metal chassis edges. Ensure the water supply is turned off to prevent accidental leaks while moving the unit.
- Access the Internal Components:
Move the washer away from the wall to access the rear. Use your Phillips #2 screwdriver to remove the two screws securing the top panel (usually located at the top-rear corners). Slide the top panel toward the back of the machine and lift it off. You will now see the large silver galvanized duct running across the top—this is the dryer assembly. - Visual Inspection and Thermal Fuse Reset:
Examine the wiring harnesses connected to the top of the duct. Look for charred wires or melted plastic connectors. On the heater housing, you will see a small thermostat (the Thermal Cut-Off). Some LG models feature a resettable fuse with a tiny red button in the center. Press it; if you hear a “click,” the unit had overheated. However, you must still find out why it overheated (usually lint or fan failure). - Testing the Heating Element:
Set your multimeter to the Lowest Ohms (Ω) setting. Disconnect the two main power leads from the heater terminals. Place a probe on each terminal. A functional LG dry heater should typically read between 15 and 30 Ohms. If your meter displays “OL” (Open Loop) or “1”, the element is burnt out and the entire heater duct or element must be replaced. - Checking the Thermistor:
Locate the thermistor (the sensor with two thin wires, often blue or white). Disconnect its plug and test for resistance. At room temperature (approx. 77°F/25°C), it should read roughly 40k to 50k Ohms. If it reads 0 (shorted) or OL (open), the sensor is defective. This is the most common “cheap fix” for a dHE error. - Evaluating the Blower Fan:
Reach into the rear of the duct (or remove the fan housing screws) and attempt to spin the fan blades manually. They should spin freely. If there is resistance, you likely have a lint clog or a seized motor. Test the motor windings for continuity. If the motor is getting 120V (during a cycle test) but not turning, the motor is the culprit. - Reassembly and Calibration:
Once the faulty component is replaced, ensure all gaskets are seated correctly to prevent steam leaks into the electronics. Reinstall the top cover and plug the unit in. Perform a “Test Mode” or a short “Dry Only” cycle to confirm the dHE code has cleared and the drum is generating heat.
Repair Specifications
- Difficulty Level: Intermediate to Advanced (Requires electrical testing)
- Estimated Time: 60 to 90 minutes
- Tools Needed:
- Digital Multimeter (capable of measuring Ohms)
- Phillips #2 Screwdriver
- Needle-nose Pliers
- 8mm and 10mm Nut Drivers
- Estimated Part Cost: $15 (Thermistor) to $160 (Complete Heater Assembly)
What Triggers this Code?
As a senior engineer, I categorize the dHE error into three primary mechanical and electrical failure modes. Understanding the “why” is crucial for an accurate diagnosis:
- Heating Element Continuity Break: Over years of expansion and contraction (thermal cycling), the nichrome wire inside the dryer heater can develop micro-fractures. Eventually, the circuit breaks. The Main PCB (Power Control Board) monitors the current draw; if it sends voltage but detects no current flow, it triggers the dHE code to prevent logic errors.
- Thermistor Impedance Drift: The thermistor is a Negative Temperature Coefficient (NTC) resistor. Its resistance should drop as temperature rises. If the internal chemicals of the thermistor degrade, it may send an “infinite resistance” signal to the board. The board interprets this as an open circuit or an impossibly low temperature, halting the cycle for safety.
- Blower Motor Stalling: LG combo units rely on a centrifugal fan to circulate hot air through the drum. If lint bypasses the filter and builds up on the fan blades, or if the motor windings fail due to a voltage spike, the air becomes stagnant. Without airflow, the heater will rapidly overheat, tripping the one-time thermal fuse (TCO) and cutting the circuit.
How to Prevent Error dHE
Prevention is centered around thermal management and airflow. The dHE error is rarely a “random” fluke; it is usually the result of environmental factors.
1. Manage Lint Accumulation: Unlike standalone dryers, washer-dryer combos use a water-condensation system. Lint can occasionally get trapped in the upper heater duct. Running a monthly “Tub Clean” cycle with a high-quality descaler helps flush out stray fibers that might otherwise clog the blower fan or coat the heating element, leading to hotspots.
2. Avoid Overloading: Overstuffing the drum prevents air from circulating. When air cannot move through the clothes, the pressure inside the heater duct rises, causing the heater to run hotter than designed. This accelerates “dry-out” of the thermistor and leads to premature element failure.
3. Use a Dedicated Surge Protector: The control boards on LG washers are sensitive to voltage fluctuations. A power surge can damage the relays that control the dry heater, leading to a permanent dHE code even if the heater itself is fine. Use a high-joule surge protector designed for major appliances.
Frequently Asked Questions
Q: Can I bypass the thermistor to get the dryer working temporarily?
A: Absolutely not. Bypassing a safety sensor like a thermistor or thermal fuse is a significant fire hazard. The control board relies on that resistance data to modulate the heater. Without it, the heater could stay energized until the metal ducting glows red, potentially melting internal components or igniting lint.
Q: My heater tested fine, but I still see the dHE code. What now?
A: If the heater, thermistor, and fan all pass continuity and resistance tests, the failure point is likely the Main PCB. Specifically, the heater relay on the board may have “stuck” open or the solder joint may have cracked. Inspect the board for burn marks or “blown” capacitors.
Q: Is the dHE error the same as the tE error?
A: They are related but distinct. The “tE” error generally refers to a generic Thermistor Error (often the wash-water sensor), whereas “dHE” is specifically isolated to the Dry Heater circuit. If you see dHE, focus exclusively on the drying components located at the top of the tub assembly.