If you own an LG dryer, you may have encountered the dreaded D90 error code. This code appears on the dryer’s display when the dryer detects poor airflow through the exhaust system.
It’s important to address this issue as soon as possible, as poor airflow can cause overheating and damage to your dryer. However, what if you’ve checked the exhaust system and found no blockage? In this article, we’ll discuss the possible causes of the LG Dryer D90 code and provide a troubleshooting guide for resolving the issue without blockage.
Possible Causes of LG Dryer D90 Code
Contents
- 1 Possible Causes of LG Dryer D90 Code
- 2 Error codes
- 3 Troubleshooting the LG Dryer D90 Code Without Blockage
- 4 Preventing Future Issues
- 4.1 FAQs
- 4.2 What is the LG dryer D90 code?
- 4.3 What causes the LG dryer D90 code?
- 4.4 How do I troubleshoot the LG dryer D90 code?
- 4.5 How can I prevent the LG dryer D90 code from occurring in the future?
- 4.6 How can I clean the exhaust system of my LG dryer?
- 4.7 Can I repair the LG dryer D90 code myself or should I call a professional?
- 4.8 Is the LG dryer D90 code covered by warranty?
- 5 Conclusion
The most common cause of the LG Dryer D90 code is a clogged exhaust system. However, if you’ve checked the exhaust system and found no blockage, there could be other causes of the issue. These include a faulty exhaust blower wheel, a malfunctioning thermistor, a defective control board, or other potential causes.
Clogged Exhaust System
While it may seem obvious, it’s worth checking the exhaust system again to make sure it’s not clogged. A clogged exhaust system can cause poor airflow and trigger the D90 code. To check for a clog, disconnect the dryer from the power source and detach the exhaust vent from the back of the dryer. Use a flashlight to inspect the inside of the vent for any blockages. If you find a clog, remove it and reconnect the exhaust vent.
Faulty Exhaust Blower Wheel
The exhaust blower wheel is responsible for circulating air through the dryer’s exhaust system. If the blower wheel is damaged or worn out, it can cause poor airflow and trigger the D90 code. To check for a faulty blower wheel, remove the dryer’s top panel and locate the blower wheel. Turn the wheel by hand to check for any resistance or wobbling. If you find any issues with the blower wheel, it may need to be replaced.
Malfunctioning Thermistor
The thermistor is a sensor that monitors the dryer’s temperature. If the thermistor is malfunctioning, it can cause the dryer to overheat, trigger the D90 code, and shut down the dryer. To check for a malfunctioning thermistor, you’ll need to use a multimeter to test the sensor’s resistance. If the resistance is outside of the expected range, the thermistor may need to be replaced.
Defective Control Board
The control board is the brain of the dryer, controlling the various functions and sensors. If the control board is defective, it can cause the dryer to malfunction and trigger the D90 code. To check for a defective control board, you’ll need to test the board’s various components using a multimeter. If any components are not functioning properly, the control board may need to be replaced.
| Cause | Description | Symptoms | Troubleshooting Steps |
|---|---|---|---|
| Clogged exhaust system | Build-up of lint and debris in the exhaust system | Poor airflow, D90 error code | Disconnect the dryer from the power source and detach the exhaust vent from the back of the dryer. Use a flashlight to inspect the inside of the vent for any blockages. If you find a clog, remove it and reconnect the exhaust vent. |
| Faulty exhaust blower wheel | Damaged or worn-out blower wheel | Poor airflow, unusual noises | Remove the dryer's top panel and locate the blower wheel. Turn the wheel by hand to check for any resistance or wobbling. If you find any issues with the blower wheel, it may need to be replaced. |
| Malfunctioning thermistor | Sensor that monitors the dryer's temperature is malfunctioning | Overheating, D90 error code, dryer shuts down | Use a multimeter to test the thermistor's resistance. If the resistance is outside of the expected range, the thermistor may need to be replaced. |
| Defective control board | The dryer's control board is malfunctioning | Various malfunctions, D90 error code | Test the control board's various components using a multimeter. If any components are not functioning properly, the control board may need to be replaced. |
| Dirty lint filter | Build-up of lint on the lint filter | Poor airflow, longer drying times | Clean the lint filter after every use. |
| Incorrect ductwork | Using improper ductwork to vent the dryer | Poor airflow, D90 error code | Use a rigid or semi-rigid metal ductwork to vent your dryer, as it provides better airflow and is less likely to become clogged. |
| Overloading the dryer | Putting too much clothing in the dryer | Poor airflow, longer drying times | Avoid overloading the dryer. |
| Incorrect dryer settings | Using the wrong dryer settings for the clothing being dried | Overdrying, D90 error code | Use the appropriate dryer settings for the type of clothing you're drying. |
| Damaged heating element | Heating element is damaged or broken | Dryer won't heat up, longer drying times | Test the heating element using a multimeter. If it's not functioning properly, it may need to be replaced. |
| Defective thermal fuse | The thermal fuse is malfunctioning | Dryer won't heat up, shorter than normal drying times | Test the thermal fuse using a multimeter. If it's not functioning properly, it may need to be replaced. |
| Malfunctioning cycling thermostat | The cycling thermostat is malfunctioning | Dryer won't heat up, shorter than normal drying times | Test the cycling thermostat using a multimeter. If it's not functioning properly, it may need to be replaced. |
| Broken drum belt | The dryer's drum belt is broken | Dryer won't spin | Inspect the drum belt for signs of wear or damage. If it's broken, it will need to be replaced. |
| Worn drum roller | The drum roller is worn out or damaged | Unusual noises, dryer won't spin | Inspect the drum roller for signs of wear or damage. If it's worn out or damaged, it will need to be replaced. |
| Damaged drive motor | The drive motor is damaged or malfunctioning | Dryer won't spin | Test the drive motor using a multimeter. If it's not functioning properly, it may need to be replaced. |
Error codes
| Error Code | Description | Possible Causes | Troubleshooting Steps |
|---|---|---|---|
| F1 | Control board malfunction | Defective control board, loose wiring | Reset the control board. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the control board may need to be replaced. |
| F2 | Temperature sensor malfunction | Malfunctioning temperature sensor, loose wiring | Test the temperature sensor using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the temperature sensor may need to be replaced. |
| F3 | Thermistor malfunction | Malfunctioning thermistor, loose wiring | Test the thermistor using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the thermistor may need to be replaced. |
| F4 | Moisture sensor malfunction | Malfunctioning moisture sensor, loose wiring | Test the moisture sensor using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the moisture sensor may need to be replaced. |
| F5 | Heating element malfunction | Damaged heating element, loose wiring | Test the heating element using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the heating element may need to be replaced. |
| F6 | Drive motor malfunction | Malfunctioning drive motor, loose wiring | Test the drive motor using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the drive motor may need to be replaced. |
| F7 | Drum roller malfunction | Worn-out or damaged drum roller, loose wiring | Inspect the drum roller for signs of wear or damage. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the drum roller may need to be replaced. |
| F8 | Exhaust system malfunction | Clogged exhaust system, faulty exhaust blower wheel, loose wiring | Disconnect the dryer from the power source and detach the exhaust vent from the back of the dryer. Use a flashlight to inspect the inside of the vent for any blockages. If you find a clog, remove it and reconnect the exhaust vent. Check the blower wheel for any damage or wear. Check the wiring connections and repair or replace any damaged wires. |
| F9 | Door switch malfunction | Malfunctioning door switch, loose wiring | Test the door switch using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the door switch may need to be replaced. |
| F10 | Drive belt malfunction | Worn-out or broken drive belt, loose wiring | Inspect the drive belt for signs of wear or damage. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the drive belt may need to be replaced. |
| E1 | Overheating | Poor airflow, malfunctioning thermistor, malfunctioning high-limit thermostat, loose wiring | Disconnect the dryer from the power source and check the exhaust system for any blockages. Test the thermistor and high-limit thermostat using a multimeter. Check the wiring connections and repair or replace any damaged wires. |
| E2 | Shorted heating element | Damaged heating element, loose wiring | Test the heating element using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the heating element may need to be replaced. |
| E3 | Dryer temperature sensor malfunction | Malfunctioning temperature sensor, loose wiring | Test the temperature sensor using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the temperature sensor may need to be replaced. |
| E4 | Excessive time to dry | Poor airflow, clogged exhaust system, loose wiring | Disconnect the dryer from the power source and detach the exhaust vent from the back of the dryer. Use a flashlight to inspect the inside of the vent for any blockages. If you find a clog, remove it and reconnect the exhaust vent. Check the airflow in the dryer and inspect the lint filter for any build-up. Check the wiring connections and repair or replace any damaged wires. |
| E5 | Control board malfunction | Defective control board, loose wiring | Reset the control board. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the control board may need to be replaced. |
| E6 | Moisture sensor malfunction | Malfunctioning moisture sensor, loose wiring | Test the moisture sensor using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the moisture sensor may need to be replaced. |
| E7 | Exhaust temperature sensor malfunction | Malfunctioning exhaust temperature sensor, loose wiring | Test the exhaust temperature sensor using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the exhaust temperature sensor may need to be replaced. |
| E8 | Drum motor malfunction | Malfunctioning drum motor, loose wiring | Test the drum motor using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the drum motor may need to be replaced. |
| E9 | Heating element temperature sensor malfunction | Malfunctioning heating element temperature sensor, loose wiring | Test the heating element temperature sensor using a multimeter. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the heating element temperature sensor may need to be replaced. |
| E10 | Control board malfunction | Defective control board, loose wiring | Reset the control board. Check the wiring connections and repair or replace any damaged wires. If the issue persists, the control board may need to be replaced. |
Troubleshooting the LG Dryer D90 Code Without Blockage
Once you’ve identified the possible cause of the D90 code, you can begin troubleshooting the issue. Here’s a step-by-step guide on how to troubleshoot the issue without blockage:
- Disconnect the dryer from the power source.
- Check the exhaust system for any blockages.
- Inspect the blower wheel for any damage or wear.
- Test the thermistor’s resistance using a multimeter.
- Test the control board’s components using a multimeter.
- If you’ve identified the issue, repair or replace the faulty component.
- Reconnect the dryer to the power source and test to see if the issue is resolved.
| Issue | Description | Possible Causes | Troubleshooting Steps |
|---|---|---|---|
| No power | The dryer won't turn on | Power outage, blown fuse or circuit breaker, faulty power cord | Check for a power outage in your area. Check the circuit breaker or fuse box and reset the breaker or replace the fuse if necessary. Inspect the power cord for any damage or wear. |
| No heat | The dryer won't produce heat | Faulty heating element, faulty high-limit thermostat, faulty cycling thermostat, faulty thermistor | Test the heating element and thermostats using a multimeter. Replace any components that are not functioning properly. |
| Overheating | The dryer is overheating | Poor airflow, malfunctioning thermistor, malfunctioning high-limit thermostat | Disconnect the dryer from the power source and check the exhaust system for any blockages. Test the thermistor and high-limit thermostat using a multimeter. Replace any components that are not functioning properly. |
| Takes too long to dry | The dryer takes longer than usual to dry clothes | Poor airflow, clogged exhaust system, dirty lint filter | Disconnect the dryer from the power source and detach the exhaust vent from the back of the dryer. Use a flashlight to inspect the inside of the vent for any blockages. If you find a clog, remove it and reconnect the exhaust vent. Clean the lint filter after every use. |
| Makes unusual noises | The dryer makes unusual or loud noises | Worn-out or damaged drum rollers, damaged blower wheel, damaged drive belt | Inspect the drum rollers, blower wheel, and drive belt for signs of wear or damage. Replace any components that are worn out or damaged. |
| Won't tumble | The dryer drum won't spin | Broken drive belt, damaged drive motor, faulty door switch | Inspect the drive belt for signs of wear or damage. Test the drive motor and door switch using a multimeter. Replace any components that are not functioning properly. |
| Won't shut off | The dryer won't stop running | Faulty timer or control board, faulty cycling thermostat | Test the timer, control board, and cycling thermostat using a multimeter. Replace any components that are not functioning properly. |
| Won't start | The dryer won't start | Faulty door switch, blown thermal fuse, faulty start switch | Test the door switch and thermal fuse using a multimeter. Inspect the start switch for any damage. Replace any components that are not functioning properly. |
| Burning smell | The dryer emits a burning odor | Overheating, faulty heating element, lint build-up | Disconnect the dryer from the power source and check the exhaust system for any blockages. Test the heating element using a multimeter. Clean the lint filter and exhaust system. |
| Dryer is vibrating or shaking | The dryer vibrates excessively or shakes during use | Uneven load, worn-out drum rollers or bearings, damaged blower wheel | Make sure the load is evenly distributed in the drum. Inspect the drum rollers, bearings, and blower wheel for signs of wear or damage. Replace any components that are worn out or damaged. |
| Drum won't turn | The dryer drum won't turn when the motor is running | Broken belt, damaged drum rollers or bearings, worn-out drive motor | Inspect the belt, drum rollers, and bearings for signs of wear or damage. Test the drive motor using a multimeter. Replace any components that are not functioning properly. |
Preventing Future Issues
To prevent future occurrences of the LG Dryer D90 code, it’s important to maintain your
dryer and perform regular cleaning and maintenance. Here are some tips to keep your dryer running efficiently:
- Clean the lint filter after every use: The lint filter should be cleaned after every use to prevent the build-up of lint, which can reduce airflow and cause overheating.
- Clean the exhaust system regularly: The exhaust system should be cleaned at least once a year to prevent the build-up of lint and other debris that can cause poor airflow.
- Use the appropriate ductwork: Use a rigid or semi-rigid metal ductwork to vent your dryer, as it provides better airflow and is less likely to become clogged.
- Avoid overloading the dryer: Overloading the dryer can cause poor airflow and reduce the dryer’s efficiency.
- Use the appropriate settings: Use the appropriate dryer settings for the type of clothing you’re drying. Overdrying can cause the clothes to become too hot and trigger the D90 code.
| Issue | Description | Possible Causes | Prevention Tips |
|---|---|---|---|
| Clogged exhaust system | Build-up of lint or debris in the exhaust system | Dirty lint filter, clogged vent, lack of regular cleaning | Clean the lint filter after every use, clean the exhaust system at least once a year, and avoid overloading the dryer. |
| Overheating | The dryer is overheating | Poor airflow, malfunctioning thermistor, malfunctioning high-limit thermostat | Disconnect the dryer from the power source and check the exhaust system for any blockages. Test the thermistor and high-limit thermostat using a multimeter. Clean the lint filter and exhaust system. |
| No heat | The dryer won't produce heat | Faulty heating element, faulty high-limit thermostat, faulty cycling thermostat, faulty thermistor | Test the heating element and thermostats using a multimeter. Replace any components that are not functioning properly. Clean the lint filter and exhaust system. |
| Takes too long to dry | The dryer takes longer than usual to dry clothes | Poor airflow, clogged exhaust system, dirty lint filter | Clean the lint filter after every use, clean the exhaust system at least once a year, and avoid overloading the dryer. |
| Makes unusual noises | The dryer makes unusual or loud noises | Worn-out or damaged drum rollers, damaged blower wheel, damaged drive belt | Inspect the drum rollers, blower wheel, and drive belt for signs of wear or damage. Replace any components that are worn out or damaged. |
| Won't tumble | The dryer drum won't spin | Broken drive belt, damaged drive motor, faulty door switch | Inspect the drive belt for signs of wear or damage. Test the drive motor and door switch using a multimeter. Clean the lint filter and exhaust system. |
| Won't shut off | The dryer won't stop running | Faulty timer or control board, faulty cycling thermostat | Test the timer, control board, and cycling thermostat using a multimeter. Clean the lint filter and exhaust system. |
| Won't start | The dryer won't start | Faulty door switch, blown thermal fuse, faulty start switch | Test the door switch and thermal fuse using a multimeter. Clean the lint filter and exhaust system. |
| Burning smell | The dryer emits a burning odor | Overheating, faulty heating element, lint build-up | Clean the lint filter after every use, clean the exhaust system at least once a year, and avoid overloading the dryer. |
| Dryer is vibrating or shaking | The dryer vibrates excessively or shakes during use | Uneven load, worn-out drum rollers or bearings, damaged blower wheel | Make sure the load is evenly distributed in the drum. Inspect the drum rollers, bearings, and blower wheel for signs of wear or damage. |
| Drum won't turn | The dryer drum won't turn when the motor is running | Broken belt, damaged drum rollers or bearings, worn-out drive motor | Inspect the belt, drum rollers, and bearings for signs of wear or damage. Clean the lint filter and exhaust system. |
| Dryer is not heating enough | The dryer is not producing enough heat | Malfunctioning thermal fuse, defective heating element, faulty gas valve | Clean the lint filter after every use, clean the exhaust system at least once a year, and avoid overloading the dryer. |
| Faulty control board | The dryer's control board is not functioning properly | Power surges, loose wiring, moisture damage | Install a surge protector, check the wiring connections and repair or replace any damaged wires. Keep the dryer in a dry area. |
FAQs
What is the LG dryer D90 code?
The LG dryer D90 code is an error code that indicates poor airflow in the dryer's exhaust system. The dryer will shut down to prevent overheating and potential fire hazards.
What causes the LG dryer D90 code?
The D90 code can be caused by a clogged exhaust system, faulty exhaust blower wheel, malfunctioning thermistor, or incorrect ductwork, among other issues.
How do I troubleshoot the LG dryer D90 code?
First, disconnect the dryer from the power source and detach the exhaust vent from the back of the dryer. Use a flashlight to inspect the inside of the vent for any blockages. If you find a clog, remove it and reconnect the exhaust vent. If there's no blockage, test the exhaust blower wheel, thermistor, and ductwork for any issues.
How can I prevent the LG dryer D90 code from occurring in the future?
Regular cleaning and maintenance of your dryer can prevent the D90 code from occurring in the future. Clean the lint filter after every use, clean the exhaust system at least once a year, and avoid overloading the dryer.
How can I clean the exhaust system of my LG dryer?
To clean the exhaust system, disconnect the dryer from the power source and detach the exhaust vent from the back of the dryer. Use a vacuum cleaner or lint brush to clean the inside of the vent and any debris that may have accumulated. Make sure the vent is reattached securely.
Can I repair the LG dryer D90 code myself or should I call a professional?
Depending on the cause of the D90 code, you may be able to repair it yourself or you may need to call a professional. If you're comfortable with electrical repairs and have the necessary tools, you may be able to troubleshoot and repair the issue yourself. However, if you're unsure or uncomfortable with the process, it's best to call a professional technician.
Is the LG dryer D90 code covered by warranty?
Depending on the age and warranty of your dryer, the D90 code may be covered by warranty. Check your owner's manual or contact LG customer support for more information.
Conclusion
The LG Dryer D90 code can be a frustrating issue to deal with, especially if there’s no blockage in the exhaust system. However, by following the troubleshooting steps outlined in this article, you should be able to identify and resolve the issue. Remember to perform regular cleaning and maintenance to prevent future occurrences of the D90 code and keep your dryer running efficiently.
- Effective Guide to GE Deep Fill Washer Troubleshooting - October 16, 2023
- Uncover the Speed: How Fast Does a Washing Machine Spin? - October 15, 2023
- The Maytag Bravos XL Dryer Not Heating: Troubleshooting Guide - October 15, 2023
