Why Your Dryer Stops Heating — A Simple Diagnosis Tree

Dryer problems feel overwhelming because there are a dozen possible causes. But here's the thing — they follow a predictable pattern. Ask the right questions in the right order and you'll find the problem fast.

Let's build a diagnosis tree.

Question 1: Does the Dryer Turn On at All?

NO → Check the power. Is it plugged in? Is the breaker tripped? Is the door fully latched? (Most dryers won't start if the door switch doesn't click.) If none of that, the start switch or timer may be faulty.

YES → Move to Question 2.

Question 2: Does the Drum Spin?

NO → You hear humming but no spinning? The belt is probably broken. Open the door and try to spin the drum by hand — if it spins freely with no resistance, the belt snapped. This is a common and inexpensive fix ($8-15 for the belt).

YES → Move to Question 3.

Question 3: Is There Airflow?

Go outside to the vent exit. Feel for warm air. Alternatively, run the dryer and hold your hand at the back — you should feel air moving through.

NO AIRFLOW → Your vent is blocked. Clean it. This is the most common and most dangerous issue (fire hazard). See our vent cleaning guide or go straight to the LG D80 diagnosis page.

YES, AIRFLOW → Move to Question 4.

Question 4: Is the Air Warm?

NO — air moves but it's cold → We've narrowed it to the heating system. Now we split:

• Electric dryer: Check the thermal fuse first (most common). Then check the heating element and high-limit thermostat.
• Gas dryer: Check the gas supply valve. Then the igniter and gas valve coils.

YES — air is warm but clothes don't dry → You likely have a partial vent blockage. Air moves but not enough of it. Also check that you're not overloading the dryer — too many clothes restricts airflow inside the drum.

Question 5: Does It Heat Initially Then Stop?

YES → This is classic cycling thermostat or high-limit thermostat behavior. The dryer heats up, hits a thermal limit, shuts off the heater, and doesn't turn it back on. Usually caused by restricted airflow (there's that vent again) or a faulty thermostat.

The Takeaway

Three of these five checkpoints require zero tools and zero money. Start there. Most dryer heating problems are airflow problems, and airflow problems are solved with a vent brush and 20 minutes.