Have you ever wondered why your LG dryer is taking too long to dry your clothes? Or worse, have you ever smelled smoke coming from your dryer? If you have,you might have encountered the LG D90error code.
The D90 code means that90% of the air that should be flowing out of your dryer is blocked somewhere in the venting system.
But what if nothing is blocking your venting system? How do youfix it then? Not to worry, there are still several things you can try to make the D90 code go away with no blockage. The problem can sometimes be the dryer itself and not theexhaust system.
In this article, you’ll learn about the differentcauses of the LG Dryer code D90, how tofixit with 10 easy methods, and ways to prevent it from occurring in the future.
Causes of LG Dryer D90 Code
Table of Contents
Many things that can cause the D90 code on LG dryers. Here are some of the most common ones:
Lint Buildup
A gradual accumulation of lint in theexhaust duct,lint filter, or external vent hoodis one of the most common triggers of the D90 error.
As repeateddrying cyclespass, denselint buildupseverely restrictsairflowby 90% or more.This excessiveblockageprompts the dryersensorsto display the D90 code.
Crushed or Damaged Exhaust Duct
If the flexibleexhaust ductconnected to the dryer’s rear vent isbent, kinked, or crushed in any way, it can significantly chokeairflowby up to 90%.
Theduct deformation limits ventilation,and that limitation can be detected by the dryer’ssensors.
Excessively Long or Winding Exhaust Duct
An excessively long, coiled, or windingexhaust ductwith too many tight turns andbendscan also trigger the D90 codeby greatly restrictingairflow.The extensive ductwork makes lint accumulation easier and hinders the dryer’s ability to receiveenough air.
Clogging in the Wall or External Vent
A clogged wall vent or external vent hood can trigger the D90error code. Theseblockagesrestrictairflow, which dryersensorsdetect as severely inadequate ventilation.
Lint anddebrisbuildup at theback of the dryeritself over time can also cause restrictions that lead to D90 errors.
Small Load Size and Drying Time
Very small loads don’t provide enough internalairflowresistance for the dryersensorsto read accurately.Thesensorscan misinterpret the lightloadas a 90% restriction, triggering a false D90 code.
Additionally,excessively longdrying timescan indicate issues withairflowor other factors affecting the dryer’s efficiency.
Clogged Lint Filter
If thelint filteris extremely clogged with accumulated lint, it can chokeairflowby over 90% past the filter. Thisairflowchoking prompts the dryersensorsto display the D90error code.
Faulty Thermostats
Defective high-limit or cycling thermostats unable to accurately monitor ventilation restrictions manifest as a D90 erroreven if noblockageexists. The faulty thermostats provide incorrect readings.
How toFixLG Dryer D90 Code
If yourLG dryeris displaying the frustrating D90 error,here are sometroubleshootingsteps you can take to resolve the problem:
1. Thoroughly Clean theLint Filter
Ready to clean the lint filter? Start by removing the lint filter and brushing off debris using a soft brush.
While you are at it, also check the air exhaust where the lint filter is housed for ant blockages (buildup of lint). If any lint or debris is found, use a vacuum cleaner or brush to clean out the air exhaust.
For filters with heavy lint buildup, wash with water and detergent. After washing, rinse the filter thoroughly with running water and allow to dry before reinserting into the LG dryer.
2. Inspect theExhaust Duct
First, unplug the dryer and disconnect the flexible exhaust hose from the back.
Look inside the duct and use a flashlight to inspect for lint buildup, especially around the ribs where lint gets trapped.
If you see any blockages, use a vacuum crevice tool to clear out the lint. Get into all the nooks and crannies.
Once it’s clean, securely reconnect the flexible hose.
Plug in and restart the dryer to see if the D90 error code has cleared.
3. Check Exterior and Wall Vents
Start by removing the outside vent cover and any vent grilles on your walls.
Shine a flashlight inside each vent and look closely for lint or debris clogging the airflow.
Use a vacuum hose and brush to thoroughly clean out any gunk inside the vents. Make sure to get into all the corners.
When done cleaning, firmly snap the vent covers back into place.
Double check the vents are completely clean before restarting your dryer. Proper ventilation is key!
4. Replace Faulty Thermostats
If you’re cycling or high-limit thermostats are defective, they can incorrectly detect airflow problems.
To replace them, first unplug the dryer and disconnect the thermostat wires.
Remove the mounting screws to detach the faulty thermostat.
Install a replacement thermostat recommended by the manufacturer. Reconnect the wires properly.
This should stop false readings that display the D90 error code.
5. Check the Power Supply andCircuit Breaker
What if you are experiencing there D90 error code because of your power supply or circuit breaker?
To cross that out of your checklist, check if your dryer is plugged into a 220-240V outlet. While checking that, also check for any damaged wiring.
Once all that is checked out, examine the circuit breaker to see if it has tripped. If you notice a tripped circuit breaker, reset it immediately.
Remember, consistent electrical power helps in preventing false readings that display the D90 error code.
If you think the problem is a faulty outlet or wiring after examination, hire an electrician to inspect and replace the faulty parts.
6. IncreaseLoadSize
For very small loads,add a few extra items to increase to about 3/4 full drum capacity. This provides enoughairflowresistance for accuratesensorreadings.
Try to avoid overloading the dryer. Overloading the dryer will overload the motor.
7. Adjust or ReplaceHeating Element
If the air in the dryer drum is not heating up properly,theheating elementmay be defective.
Access the element by unplugging the dryer and removing the rear panel.Inspect the element and adjust/resecure if loose.
If burnt out,install a manufacturer-approved replacementwith matching specs.
8. Adjust Flow Sense Setting
If it seems overly sensitive, check the owner’s manual on how toenter diagnostic mode and lower the “Flow Sense” setting. This prevents minor restrictions from erroneously triggering a D90 code.
Related Article:Flow Sense Overview
9. Check theThermal Fuse
In some cases,a faultythermal fusecan cause the LG Dryer D90 code to appear. Thethermal fuseis a safety device that protects the dryer from overheating. If it becomes faulty or blows, it can disrupt the drying process and triggererror codes.
Use a multimeter to test thethermal fusefor continuity.If it is blown or defective, it will need to be replaced with a compatiblethermal fuseto restore the dryer’s functionality and eliminate the D90error code.
10. Professional Diagnosis and Repair
If you have tried all the above steps and still get the LG dryer D90 code but noblockage, you may need tocontact LG support or a qualifiedtechnicianfor further diagnosis and repair.
There may be anunderlying issue with the control board or other componentsthat requires professional attention.
Preventing LG Dryer D90 Code
You canprevent the annoying D90error codefrom appearing again in the futureby implementing the following preventative maintenance measures:
Clean the lint filter after every cycle
Get into the habit of removing and cleaning thelint filterafter each drying cycle.
Regularlint filtermaintenance prevents gradual accumulationthat can chokeairflow.
Annual professional duct cleaning
Hire an HVACtechnicianonce a yearto thoroughly clean the entire length of the dryerductingand external vent hood. They have specialized tools to clear lint in hard-to-reach areas. Professional cleaning preventslint buildupover time.
Inspect ducting for damage
Periodically inspect the flexibleexhaust ductfor any crushing, kinking, or damage.
Straighten out any crushed sections andreplace theductif damaged. Deformedductsseverely restrictairflow.
Use smooth rigid metal ducts
When installing a new dryer,use smooth rigid metal ductworkrather than foil or flexible ribbedducts.
Rigid metalductsminimize lint accumulationand relatedairflow restrictions.
Limit ductwork length
Configure theexhaust ductpathway to be as short and straight as possible during installation. Follow the manufacturer’s recommended limits for optimalairflow.
Conclusion
TheLG dryer D90 codeis a serious issue that needs your attention.
The D90 code indicates thatyour dryer’sventilation systemis almost completely blocked by lint or otherdebris,which can cause many problems for your dryer and your home.
It can make your LG dryerinefficient, waste energy, and even start a fire.
To avoid these risks,you need to clean your dryer regularly and thoroughly. You need to wash thelint filter, and clear theexhaust hose, thewall duct, and theoutside ventof anyblockage.
You can also use the flow sense feature on your dryer to check theairflowand prevent the LG D90 error from happening again.
By doing these simple steps,you canfixthe LG dryer D90 code and make your dryer work better and safer.
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Adrian Simmons( Licensed Appliance Repair Expert )
Adrian is an ISCET licensed professional that has completed the National Appliance Service Technician Certification Exam and has the expertise to diagnose and repair any appliance. He is well-versed in the latest technologies and techniques and is always up-to-date on the latest industry standards.
