LG T1700 Dryer Error Code 42 Troubleshoot and Resolve

Introduction

When an LG T1700 dryer displays Error Code 42, it signals that something in the drying cycle has gone wrong. For many homeowners, a malfunctioning dryer can become a major inconvenience, especially during the busy laundry season. Understanding what Error Code 42 means, identifying its root causes, and following a clear step‑by‑step troubleshooting guide can save time, reduce frustration, and prevent unnecessary trips to a technician. This guide explains the error, explores common causes, and offers practical solutions to get your dryer back into operation.

What Error Code 42 Means

LG dryers use a numeric system to report faults. Error Code 42 is associated with the dryer’s heat or temperature sensor system. When the system detects an abnormal temperature reading—either too high or too low—it triggers the error to protect the appliance and prevent potential fire hazards. In other words, the dryer is telling you that its internal temperature monitoring is not functioning as expected.

Why Temperature Issues Matter

• Safety: Overheating can lead to fires.
• Performance: Incorrect temperature readings can cause clothes to dry unevenly or damage fabrics.
• Energy Efficiency: Faulty sensors may cause the dryer to run longer than necessary, wasting energy.

Common Causes of Error Code 42

These causes often overlap, making a systematic approach essential.

Step‑by‑Step Troubleshooting

1. Power Reset

Many digital errors are temporary glitches that resolve after a reset.

1. Unplug the dryer from the wall outlet.
2. Wait 60 seconds.
3. Plug it back in.
4. Turn the dryer on and run a short cycle.

If the error clears, the problem was likely a brief software hiccup. If not, proceed to the next step.

2. Inspect the Vents and Lint Filter

A clogged vent can create dangerous heat buildup.

• Check the Lint Filter: Remove the filter, clean it, and reinstall.
• Examine the Exterior Vent: Ensure it is free of obstructions.
• Inspect the Internal Vent Hose: Look for kinks, tears, or blocked sections.

After cleaning, run a cycle to see if the error persists.

3. Examine the Heating Element

The heating element is where heat is generated. Any damage can cause uneven temperatures.

• Locate the heating element (usually near the back of the drum).
• Look for visible scorch marks, cracks, or a broken coil.
• If you find damage, replacement is required. Contact a professional for assistance.

4. Test the Thermostat

The thermostat regulates the dryer’s temperature.

1. Unplug the dryer again.
2. Locate the thermostat (often near the heating element).
3. Disconnect the thermostat wires.
4. Use a multimeter set to the resistance (ohms) setting.
   • With the thermostat disconnected, check the reading.
   • If the resistance reads “0” or “infinity,” the thermostat may be faulty.

Replace if necessary. If you are unsure how to test, skip to the next step.

5. Check the Wiring and Connections

Loose or damaged wires can lead to false sensor readings.

• Open the dryer’s rear panel.
• Inspect all wiring for fraying or disconnection.
• Tighten any loose connections.
• If any wire shows damage, cut it and replace it with a compatible replacement.

6. Inspect the Control Board

If all physical components appear fine, the control board may be at fault.

• Look for burnt markings or visible damage on the board.
• If you notice any, contact LG support or a licensed technician.

Control board repairs are usually beyond DIY scope.

7. Verify the Power Supply

An inconsistent voltage supply can confuse the temperature sensor.

• Check the outlet voltage using a multimeter.
• If voltage is below the dryer’s specifications, address the electrical issue with a professional electrician.

When to Call a Professional

• You encounter a damaged heating element or thermostat that requires replacement.
• The control board shows signs of damage or the error persists after all DIY steps.
• You are unsure about any step in the troubleshooting process.
• You suspect electrical issues that involve wiring deeper than the dryer’s interior.

Professional service ensures safety and accuracy, especially when dealing with high‑voltage components.

Preventive Maintenance Tips

Preventing Error Code 42 involves routine care:

1. Clean the Lint Filter After Every Load
   Even a small amount of lint can obstruct airflow over time.

2. Vacuum the Vent Duct Monthly
   Use a long brush or vacuum attachment to remove accumulated lint.

3. Inspect the Heating Element Annually
   Look for signs of wear or damage and replace if necessary.

4. Keep the Dryer Room Well Ventilated
   Adequate airflow reduces the risk of overheating.

5. Schedule a Professional Inspection Every 1–2 Years
   A technician can spot hidden issues before they trigger an error.

FAQs

Q: Can I keep the dryer running while troubleshooting?
A: Never operate the dryer while it displays an error code. The unit may not function correctly and could pose safety risks.

Q: Does Error Code 42 always mean a faulty thermostat?
A: Not always. While the thermostat is a common culprit, other components like the heating element, vents, or control board can also trigger the error.

Q: How long does a professional repair usually take?
A: Depending on the issue, a technician can often complete a diagnosis and repair in 1–2 hours.

Q: Will a new thermostat fix the problem if I’ve already tried resetting?
A: If the thermostat is indeed the root cause, replacing it should eliminate the error. However, confirm that no other component is contributing to the issue.

Q: Is it safe to replace the thermostat myself?
A: If you are comfortable with basic electrical work and have the correct replacement part, it is safe. Otherwise, ask a professional.

Conclusion

Error Code 42 on an LG T1700 dryer is a signal that the appliance’s temperature monitoring is compromised. By systematically resetting the unit, cleaning vents, inspecting the heating element and thermostat, checking wiring, and evaluating the control board, most homeowners can pinpoint and resolve the issue without professional help. Regular maintenance and timely intervention not only keep the dryer running efficiently but also safeguard your home against fire hazards. If any step feels beyond your comfort level or if the error persists, don't hesitate to reach out to a qualified technician. A functioning dryer saves time, reduces stress, and keeps your laundry routine smooth.