LG Dryer d90 Error Code But No Blockage – Troubleshooting Guide

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Modern dryers can be efficient but their computer error codes can be confusing and even frustrating to figure out what’s wrong and how to fix it. Most of the time, problems with a dryer can be easily resolved without calling a technician. You can diagnose many things yourself. 

It may seem odd that to see an LG dryer d90 code but no blockage. After all, a d90 code is supposed to mean there is a 90 percent blockage in the vent hose or vent line. The only other possibility it could be is a faulty heating element or thermal fuse.

This may take some creativity to solve but is one of the problems you can diagnose and remedy yourself. 

The article below will explain all you need to know about resolving the problem. 

What the d90 Code Means?

Your LG dryer had four display bars that Flow Sense illuminated. This display monitors clogs and will show you when you have a serious airflow problem. It one display issues until you have an 80 percent clog. 

At that point, there will be four bars showing with a d80 error code. However, the dry will stil run at that level of clogging. When the airflow restriction reaches a 90 percent clog, you will see four vars and a d90 error light. 

The dryer then goes into a self-protect mode to avoid overheating. It will begin to cool down and will stop. It will run fine again once the clog is cleared. 

Read: LG Dryer Flow Sense – What It Is And How It Works?

Troubleshooting Steps

There are specific things you can do when this happens to find the clog, remove it and have your LG dryer working again. 

The first thing you do is unplug the dyer. 

Check Lint Filter

The best plan of action is to move from the dryer’s front portion to the back to check for clogs and debris. That means the first thing to check is the lint filter. Lift it out to make sure it’s clean. That is probably not your problem but a dirty lint filter could affect airflow. 

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Read: 6 Reasons Why LG Dryer Won’t Start

Look at the Exhaust Hose

The next thing to check is the exhaust hose. This is the hose that runs from the dryer’s back to the wall vent. Lint could have nearly blocked all airflow. Be sure the vent hose isn’t kinked or twisted. 

You can disconnect the hose from the dryer to check it. You can blow into the hose to clear it or you can clear it by using something like a hairdryer blowing through the hose. You can also take a snake and run it through the hose to clear any clogs. 

Check the Wall Duct

The next thing to check is the wall duct where the exhaust hone connects. Remove the hose from the duct to make sure a large piece of lint isn’t blocking it preventing airflow through the wall. 

You may have to clear this out by hand. Another thing you can do is to attach a leaf blower in a way that blows out the vent. A leaf blower will produce more air pressure than the dryer so it should blow any little clogs through. 

Look at the Outside Vent

The outside vent is what allows the inside heat and air from the dryer to escape the house. It is attached to the vent you found in the wall. 

In most homes, the outside vent is directly opposite the inside wall vent on the side of the house. Most homes are set up where the dryer’s location is along an exterior wall so there is only a short distance to run the outside vent. 

However, some homes do have roof vents so you may have to look to find yours if you don’t already know where it is. 

Look immediately inside the lint vent to see if there is a collection of debris that makes airflow difficult. You can clean this out by hand or with a small tool to scrape or pull lint out. 

Since outdoor vents are subjected to the weather, some of the lint and dirt may have become hardened which could be what is closing off airflow. This may be a little difficult to removed but you may be able to soften it with water and a small brush. 

Read: Why Is LG Dryer’s Steam Fresh Cycle Not Working?

Resetting the Dryer

Once you have followed these steps, you can plug the dryer back in. It should reset and clear the error code once it’s plugged in. Don’t reconnect the hose yet. There is one more thing to do.

Troubleshooting Test

See if your clothes are still wet. If they are, turn the dryer back on without the vent hose to see if they dry within an appropriate period.

Those whose clothes were mostly dry when the error occurred will need to remove them and put in some wet clothes from the washer. Turn it on to see how they dry. If they dry within the normal time frame, then your clog has to be in the exhaust. 

Clothes that don’t dry or that take too long to dry indicate you could have a failing heating element or thermal fuse. 

A good test that shows the clothes are drying means you can turn off the dryer and reconnect the hose to the dryer. Run a load of wet clothes in a new round to see if they dry as well as the first load. 

If they dry well without the error code showing up, then you’ve fixed your problem. 

Read: Top 5 Common LG Dryer Problems

What If There Isn’t a Blockage?

Those who do all of the steps above and find there isn’t a blockage may have a bad element or fuse. While that code is for a blockage, some experts say a bad heating part could cause it also. This is where you need to call the support center to get a service technician to replace the worn-out part. 

Can I just reset the dryer to fix the error?

While resetting the dryer will eliminate many errors, it will not reset the Flow Sense error until you’ve clean any blockages from the lint filters and exhaust system. The air must flow correctly again to get rid of the error.

Why am I seeing Flow Sense flashing?

This is the advanced warning system that draws your attention to anything going wrong with the household ductwork or hose to the dryer. An alert means you need to stop and clean the system. 

Signs of a Growing Clog

There are signals that you are developing a clogged dryer vent even before the first Flow Sense alert comes on. There will be excessive drying times. This is a key first indicator of a problem. The clothes aren’t fully drying as they once did in a normal dryer cycle. 

You may also notice a burning smell coming from the dryer. This becomes apparent when a clothes running through a long dryer cycle.

The interior of the dryer is extremely hot, indicating it is running harder than it’s supposed to run. You also keep pulling a lot of lint from the lint trap. All of this means you should go ahead and check your hose and ductwork before the light comes on. 

Read: LG Dryer Error Code D80 D90 D95 – How To Fix It?

When should dryer vents be cleaned?

You should clean out your dryer vents annually. It depends on how much laundry you do. Those who have larger families and do a lot of laundry loads may need to clean out their dryer vents twice a year or more.

Dryer Safety

Allowing lint to accumulate in the hose, lint trap and duct is a fire hazard. Lint can eventually get hot behind the dryer and catch fire. Many home fires start because of a dryer clogging issue. This is why the Flow Sense system was created to alert you to clogs before they become a safety issue.

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