LG Dryer Stuck in Cooling Mode and won’t heat? Fix it with $10 & a screwdriver.

Recently, I had a problem with my LG dryer. I could turn it on, and it would run, but the clothes never dried because the dryer didn’t apply any heat. On top of that, the cooling indicator light remained on from the beginning of the cycle until the end.

It turned out that it was an easy fix. The hardest part was waiting for the parts to arrive from Amazon. 🙂

In this post, I’ll share my journey to diagnose and fix this common problem and show you how you can fix it for about $10, a couple of hours, and a screwdriver.

The Cause

After some research, I learned that this issue was likely one of two things: a blown circuit breaker or a blown thermal fuse. The overwhelmingly common cause is a blown thermal fuse.

The LG manual states that the issue is one of three things:

  • The house fuse (thermal fuse) is blown
  • A circuit breaker has tripped
  • A power outage has occurred

It’s probably a blown thermal fuse.

A thermal fuse is a critical safety device designed to protect your dryer from overheating. The thermal fuse monitors the temperature within the dryer’s heating chamber. If the temperature reaches an unsafe level, the thermal fuse will blow or trip, cutting off the electrical circuit to the heating element. This action prevents the dryer from continuing to heat, reducing the risk of overheating and potential fire hazards.

I never knew what a thermal fuse was, but I’m glad it exists…

A thermal fuse in a dryer can blow or “trip” for several reasons:

  • Blocked or Restricted Venting: Insufficient airflow due to a clogged dryer vent or exhaust duct can cause the dryer to overheat. When hot air cannot escape, it builds up inside the dryer, triggering the thermal fuse.
  • Lint Accumulation: Lint is highly flammable, and if it accumulates within the dryer, particularly around the heating element or in the exhaust duct, it can catch fire or cause the temperature to rise excessively.
  • High Heat Levels: If the dryer’s thermostat fails, the heating element can get too hot. This increased heat can lead to thermal fuse failure.
  • Overloading the Dryer: Running the dryer with an oversized load can strain its heating element and other components, potentially causing overheating and thermal fuse activation.
  • Faulty Components: Malfunctioning heating elements, thermostats, or other electrical components can lead to elevated temperatures in the dryer, resulting in thermal fuse blowing.
  • Wiring Issues: Poor or damaged electrical connections and wiring within the dryer can generate excessive heat, leading to thermal fuse failure.
  • Improper Use or Settings: Operating the dryer at excessively high heat settings or for extended periods without breaks can cause the dryer to overheat.

This often shows up after a d90 error.

If any of these sound familiar, you’re probably looking at a blown thermal fuse. In my case, the exhaust duct was crimped behind the dryer so the hot air could not escape and thus overheated the dryer. This blew the fuse, and here we are…

The Solution

Step 1. Get your tools and parts

I could recommend that you first test the parts that you’ll need to replace, but in my case, I decided to buy the parts first because they are cheaper than the testing device.

If you want to and you have a multimeter, you can first test your thermal fuse.

You only need three things:

  1. A new thermal fuse to replace a blown thermal fuse.
  2. A Philips head screwdriver to disassemble your dryer. (Yep, that’s it!)
  3. A butter knife (really) to release the tab that holds the top on

Step 2. Disassemble your dryer

Safety first! Remember to unplug your dryer.

I learned that disassembling a dryer is surprisingly easy. The thermal fuse is accessible by removing only 10. The trickiest part is removing the top. Here’s a helpful video to get started.

Once you’ve got the top off, you’ll need to remove the front face of the dryer and the drum. That’s covered in the video below, and as long as you have a flashlight (could be your phone) and a screwdriver, it’s a piece of cake.

Step 3: Replace the dryer’s thermal fuse

Now that you’ve removed the dryer drum, replacing the thermal fuse is just a matter of disconnecting the wiring and removing the screws that hold it to the dryer frame. This video provides thorough and clear instructions to get to the thermal fuse location and replace them.

Consider replacing your dryer vent duct

As I mentioned before, for me, it was a dryer vent duct that caused the problem in the first place. It had gotten really stretched out and banged up, which restricted the flow of warm air leaving the dryer. After replacing the thermal fuse, cleaning out the interior of the dryer, and replacing the vent duct, the dryer worked way better than before the problem started.

If you found this post helpful, consider checking out these products that I used to solve this problem.

A note on applicable LG Dryers

To make it really clear what dryers and parts these apply to, here are the model lists.

This thermal fuse applies to the following LG dryer models: DLE0332W, DLE0442W, DLE2512W, DLE2514W, DLE2515S, DLE2516W, DLE2532W, DLE3733S, DLE3733W, DLE3777W, DLE5955G, DLE5955W, DLE5977B, DLE5977S, DLE5977SM, DLE5977W, DLE6942W, DLE7177WM, DLE8377NM, DLE8377WM, DLE9577SM, DLE9577WM, DLEX7177RM, DLEX7177WM, DLG2524W, DLE5932S, TDV10031E, TDV10030E, DLE3733U, DL, DLE0442G, TDV10032E, DLEX8377WM, RV1306AT, RV1316AS, RV1321AS, RV1304A, RV1304B, RV1306BT, RV1319VS, DLE5932W, TDV10035E, TDV10135E, RV1307B, TDV10092EK, RV1310A, RV1310B, TDV10177EM, CDE3379WN, TDV10090E, TDV10240E, TDV10241E, TDV10092E, RV1317AS, RV1327AY, TDV10244E, DLE2050W, RV1316A, RV1316B, TDV10245E, DLE2301R, DLE2101W, DLE2301W, DLE2601R, TDV10246E, DLE2601W, DLE2701V, RV1319E, TDV10248E, TDV10249E, DLEX3875V, DLEX3875W, TDV10051E, DLEX0001TM, TDV10052E, RV1308AS, DLE1310W, TDV10053E, RV1308BS, RV1316VS, RV1321VS, RV1308CS, TDV10055E, TDV10056E, TDV10159EM, TDV10060E, RV1317TS, TDV10062E, DLE7177RM, RV1309AT, RV1309BT, TDV10066E, TDV10150EM, TDV10170EM, TDV10180EM, RV1305AT, RV1310AS, DLEX2801L, DLEX2501V.

Good luck! I hope you find fixing your dryer as satisfying as I did!

Leave a Comment

Your email address will not be published. Required fields are marked *