LG Dryer Error Code d85

LG dryer error code d85 appears when the dryer detects a problem with the way it is sensing temperature or moisture, or when there is a communication/feedback issue between sensors and the control board. When the machine cannot correctly read how warm or dry the drum is, it can interrupt normal cycles and display the D85 code to protect the appliance and reduce safety risks. Users commonly notice longer drying times, clothes that stay damp, interrupted cycles, or the dryer shutting down unexpectedly. Left unresolved, this condition may increase energy use, accelerate wear on heating components, and in rare cases create overheating risks if temperature monitoring is compromised.

Common causes

• Faulty moisture sensor (sensor strips inside the drum) or corroded sensor contacts
• Defective thermistor / temperature sensor or open/short in the thermistor circuit
• Blocked or restricted venting and lint build-up causing poor airflow and misleading temperature readings
• Failing main control board or sensor communication fault
• Damaged wiring harness or loose connectors between sensors and control board
• Open thermal fuse or high-limit thermostat that has tripped or failed
• Partial heating element failure (intermittent heating) affecting sensor feedback
• Blower motor issues reducing air movement and altering temperature/moisture readings
• Door switch or door seal faults preventing proper cycle initiation or accurate sensing

Troubleshooting steps

1. Power cycle the dryer: unplug or switch off the breaker for 1 minute, then restore power and see if D85 clears. This resets the control and can resolve transient communication faults.
2. Confirm the exact meaning for your model: check the owner manual or the error code sticker on the dryer door/frame since LG codes and descriptions can vary by series.
3. Inspect and clean the lint filter and drum sensor strips: remove lint and residue from the lint trap and the small metal sensor strips on the drum surface (clean with a soft cloth and rubbing alcohol if needed).
4. Check venting and airflow: disconnect the vent and run the dryer on a timed cycle to feel airflow. Clean the entire vent path including flexible hose, wall duct, and outside vent hood; restricted airflow often triggers sensor-related errors and long dry times.
5. Run a diagnostic / service mode (if available): many LG dryers have a self-test that can reveal failing sensors or communication errors. Refer to your manual for the button sequence.
6. Inspect wiring and connectors: unplug the dryer, remove the rear panel or top per the service manual, and visually check sensor and board connectors for corrosion, loose pins, or damaged wires.
7. Test sensors and components with a multimeter: measure thermistor or moisture sensor resistance and compare to model specifications in the service manual. Do not attempt if you are not comfortable using electrical test tools.
8. Verify heating components: check the heating element, thermal fuse, and high-limit thermostat for continuity. An intermittently failing heater or open thermal fuse can confuse the control and display D85.
9. Swap or reseat connectors: sometimes disconnecting and reconnecting sensor harnesses and the main board connector clears poor contacts causing D85.
10. Reset and test: after cleaning and checks, run a sensor cycle with a small load to verify proper operation. If the code returns, document when it appears (start, mid-cycle, at end) — this helps a technician diagnose the faulty part.
11. Contact LG or a qualified technician: if basic checks don’t clear the code or you find failed components, call a professional. Avoid bypassing safety devices like thermal fuses.

Maintenance / Prevention Tips

• Clean the lint filter after every load to ensure proper airflow and accurate sensor readings.
• Inspect and clean the moisture sensor strips monthly using a soft cloth and alcohol to remove fabric softener build-up.
• Clean the entire vent system at least twice a year; more often for heavy use.
• Use rigid metal duct or short, smooth-walled hoses to reduce lint traps and improve airflow.
• Keep the outside vent hood clear of debris, bird nests, and ice.
• Avoid overloading the dryer; overloaded drums reduce air circulation and increase sensor errors.
• Use appropriate cycles (sensor dry vs timed) so the machine can properly judge moisture levels.
• Inspect the vent connection and hose for kinks or crushing that restrict flow.
• Periodically vacuum lint that accumulates beneath and behind the dryer.
• Replace worn or damaged vent hose and connectors promptly.
• Check power connections and ensure the dryer is on a dedicated circuit without frequent power interruptions.
• Keep the dryer level and stable to avoid door or switch alignment issues.
• Schedule annual professional maintenance if the dryer gets heavy household use.
• Avoid using excessive fabric softener sheets that can coat sensor strips; wipe sensors more frequently if you use them often.
• Replace thermal fuses and limit switches as recommended if they show signs of wear or frequent tripping.

FAQ

Conclusion / Safety Notice: Safety first: always disconnect power before opening panels or testing electrical components. Do not bypass thermal fuses or safety thermostats — they protect against overheating and fire. If troubleshooting requires testing high-voltage circuits, replacing sealed heating assemblies, or changing the main control board, hire a certified appliance technician or contact LG service to avoid injury and ensure the repair is done correctly.

If you’re comfortable with basic cleaning and visual inspections, start there. For persistent errors, intermittent heating, or signs of electrical damage, contact an authorized LG repair center or a licensed technician to diagnose and replace faulty parts safely.