LG DLE7300WE Moisture Sensor Replacement – How to Diagnose & Fix
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Understanding the Problem
What the moisture sensor does and why it matters: The moisture sensor (sensor bars/strip) tells the dryer when clothes are dry so the machine can stop at the right time. If the sensor fails or is covered in residue, the dryer may over-dry, under-dry, run a full timed cycle only, or stop too early. Below are practical diagnostic and replacement steps for the LG DLE7300WE. 1) Confirm the symptom and try a simple fix first - Symptom checklist: clothes come out damp, dryer always uses a full timed cycle, or dryer over-dries. If so, start by cleaning the sensor bars (see step 2). 2) Clean the sensors (quick test) - Unplug the dryer. - Open the lint filter and remove it. Inspect the sensor bars (two metal strips) located inside the lint housing or just behind the filter opening on the front of the drum. - Wipe the metal bars with a cloth dampened with isopropyl alcohol (or a bit of vinegar). Let dry, reassemble, and run a test load of damp towels. If the dryer behavior returns to normal, replacement may not be needed. 3) Visual inspection - Unplug the dryer. - Remove the lint filter and inspect sensor bars for heavy corrosion, pitting, broken wires, or loose connectors. If you see corrosion or broken metal, replace the sensor. 4) Electrical test with a multimeter (diagnostic) - With the dryer unplugged, disconnect the moisture sensor from its harness (pull the connector). Set a digital multimeter to measure resistance (ohms). - Probe the two sensor wires/terminals. Dry sensor should read high resistance or open; when you touch/wet the sensor bars with a wet cloth, the resistance should drop significantly. If resistance does not change when wet, the sensor is faulty. 5) Remove the old sensor (typical access for LG front dryers like DLE7300WE) - Unplug the dryer from the power source (and shut off gas if this were a gas model). - Remove the lint filter and remove the screws holding the lint filter housing (there are usually 2–4 screws inside the filter opening). Carefully pull the housing forward to access the sensor assembly. - Locate the sensor bars (usually one or two metal strips mounted in the housing or on the cabinet). Remove the mounting screws or clips holding the sensor bar in place. - Disconnect the harness connector and remove the sensor assembly. 6) Install the new sensor - Compare the new sensor to the old one to verify fit and connector type. - Plug the sensor harness into the new sensor, position the sensor in the same orientation, and secure it with the screws or clips. - Reinstall the lint filter housing and the lint screen. - Plug the dryer back in and run a test load of damp towels on an auto-dry cycle to confirm proper operation. 7) When to suspect other components - If the sensor checks good electrically but the dryer still ignores it, inspect the harness for damaged wires and the main control board for obvious burn marks or connector issues. Control board failure is less common but possible. Safety note: Always unplug the dryer (and shut off gas on gas models) before testing or working on electrical components. If you are not comfortable working with appliance wiring and disassembly, hire a qualified technician.
Common Symptoms
Dryer runs too long or always on timed cycle, clothes still damp after cycles, dryer over-dries, auto-dry cycles not terminating correctly.
Common Causes
- Contaminated sensor bars (fabric softener, dryer sheet residue, lint build-up)
- Corroded or physically damaged sensor bars/strip
- Damaged or corroded sensor harness/connector
- Failed main control board (less common)
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Helpful Repair Tip
First try cleaning the metal sensor bars with isopropyl alcohol — many ‘bad sensor’ complaints are just residue. If cleaning doesn't change the multimeter reading (resistance should drop when wet), the sensor needs replacement.
Frequently Asked Questions
How long does it take to replace the moisture sensor?
About 20–45 minutes for a homeowner with basic tools: unplug appliance, remove lint filter/housing, swap the sensor and connector, reassemble, and test. Cleaning the sensor first takes only 5–10 minutes.
Can I clean the moisture sensor instead of replacing it?
Yes — cleaning with isopropyl alcohol or a vinegar solution often restores proper sensing if buildup is the problem. Replace only if cleaning doesn't change the sensor's electrical behavior (no resistance change when wet) or if the sensor is corroded/damaged.
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