Whirlpool Dryer Not Heating or Overheating — 5 Causes & How to Fix

Last week, a customer called about their Whirlpool WED5000DW2. Drum spins perfectly, no weird noises, but clothes come out cold and damp after an hour. Sound familiar? Here's the frustrating part: they'd already replaced the heating element and thermal fuse, checked continuity on everything, and still no heat. Turns out the real culprit was a faulty cycling thermostat — the 3387134 — which never told the element to fire up in the first place.

Before you start pulling panels off, let's narrow down what's actually happening. The cycling thermostat controls when your heating element turns on and off to maintain proper temperature. When it fails, you get either no heat at all or dangerously high temperatures that could scorch your clothes.

Quick Symptom Check

• Drum spins but no heat: Most common cycling thermostat failure
• Dryer runs too hot: Thermostat stuck closed, element won't shut off
• Heat stays on after drum stops: Classic sign of thermostat welding shut
• Clothes take 2-3 cycles to dry: Intermittent heating from failing thermostat
• Won't start at all: Less common, but possible if thermostat is part of the safety circuit

Cause #1: Failed Cycling Thermostat (60% Probability)

The cycling thermostat — part number 3387134 — is a small bimetal switch mounted on the blower housing. It's designed to open and close thousands of times, cycling the heat on and off to maintain 130-150°F. After years of heat stress, the contacts wear out or the bimetal strip loses calibration.

How to diagnose: Unplug the dryer and remove the front panel (four screws along the top under the lint screen, two at the bottom). Locate the cycling thermostat on the blower housing — it's a small disc with two wires. Disconnect the wires and test with a multimeter set to ohms. At room temperature, it should read 0-2 ohms (closed circuit). If it reads infinite resistance, it's failed open and won't let the element heat.

Here's the tricky part: a cycling thermostat can also fail closed, which means it'll test fine with a multimeter but won't actually open when the dryer heats up. If your dryer is overheating or scorching clothes, this is your problem. You'll need to test it under heat conditions or just replace it — at $24.99, it's cheaper than a service call.

Compatible Models

This thermostat fits dozens of Whirlpool, Maytag, Kenmore, and Amana models, including WED5000DW2, WED9200SQ0, MEDC215EW1, and NED4655EW. It replaces part numbers WP3387134, AP6008270, 306910, 3387135, and 3387139.

Cause #2: Blown Thermal Fuse (25% Probability)

The thermal fuse is a one-time safety device that blows if your dryer overheats beyond 185°F. It's usually located on the blower housing near the cycling thermostat. When it blows, it cuts power to the heating element entirely — drum will spin, but zero heat.

Why it matters: If your thermal fuse is blown, something caused your dryer to overheat. Could be a clogged vent, bad cycling thermostat, or failed high-limit thermostat. Replace the fuse, but also find and fix the root cause or you'll blow another one in a month.

Test it the same way as the cycling thermostat: disconnect wires, check continuity. Should read 0 ohms. If it's open (infinite resistance), it's blown. Note: unlike the cycling thermostat, the thermal fuse doesn't reset. Once it's blown, it's done.

Cause #3: Faulty Heating Element (10% Probability)

The heating element itself can fail, but here's what most people miss: it usually fails shorted rather than open. A shorted element will trip your circuit breaker or blow the thermal fuse immediately when you start the dryer. An open element (broken wire) gives you the same symptom as a bad cycling thermostat — no heat at all.

Visual inspection helps here. Remove the lower front panel and look at the element housing. See any scorch marks? Smell burnt insulation? That's a shorted element. To test properly, disconnect power and remove both element wires. Test resistance between each terminal and the metal housing. Should read infinite. If you get any continuity to ground, the element is shorted.

Cause #4: Breaker Lost One Leg (5% Probability)

Here's a sneaky one from a real user: "Replaced the heating element and fuse. Had continuity through circuit but still wouldn't work. Replaced additional thermostats etc., it turns out that when the heating element shorted it also damaged the breaker, so I lost one leg of the circuit. Hence the drum would turn but no heat. Check the breaker for 240."

Dryers need 240V — two 120V hot legs. The motor runs on 120V, so if one leg of your breaker fails, the drum spins normally but the heating element (which needs 240V) won't work. Grab a multimeter and check voltage at the dryer terminal block. Should read 120V from each hot leg to neutral, and 240V across both hot legs. If you're only seeing 120V total, you've lost a leg somewhere — bad breaker, loose wire, or corroded connection.

Cause #5: Timer or Control Board Failure (Rare)

If the cycling thermostat, thermal fuse, and element all test good, you might have a timer or electronic control issue. The timer controls when power flows to the heating circuit. A failed timer contact won't send voltage to the element even when everything else is working.

This is harder to diagnose without a wiring diagram. If you've got a mechanical timer (the old dial type), you can sometimes hear or feel when the contacts are switching. Electronic controls require a tech with proper diagnostic equipment. Honestly, at this point, it's worth calling a pro unless you're comfortable with electrical troubleshooting.

The 30-Minute Fix

Tools needed: Nutdriver set, Phillips and flathead screwdrivers, multimeter

Difficulty: Easy — even if you've never opened a dryer before

Average repair time: 30-60 minutes

Replacing the cycling thermostat on models like the Whirlpool WED4815EW or Maytag MEDC400VW0 is straightforward. Unplug the dryer, remove the front panel, disconnect the two wires from the old thermostat, pop it off its mounting bracket, and install the new one. The 3387134 comes with mounting hardware if you need it. Reconnect the wires (doesn't matter which wire goes where — it's not polarized), reassemble, and test.

When to Call a Pro

Call a technician if:

• You've replaced the cycling thermostat and thermal fuse, but still no heat
• Your dryer keeps blowing thermal fuses repeatedly
• You're not comfortable working around 240V circuits
• You've got an electronic control model and suspect a board failure

Average service call runs $150-$250 depending on your area. Parts are usually extra.

Frequently Asked Questions

Can I test the cycling thermostat without removing it from the dryer?

Technically yes — you can access the wire terminals and test continuity without fully removing it. But you won't be able to test it under heat, which is when most cycling thermostats actually fail. If it tests good cold but your dryer still isn't heating properly, pull it out and replace it anyway. At $24.99 for the 3387134, it's cheap insurance.

Why does my Whirlpool dryer heat intermittently?

Intermittent heating usually means the cycling thermostat is on its way out. The bimetal contacts are corroded or worn, so they make inconsistent connection. Sometimes the dryer heats, sometimes it doesn't. You might also have a loose wire connection at the thermostat terminals — check for burnt or discolored wires before assuming the part is bad.

Will a bad cycling thermostat cause the dryer to overheat?

Yes, if it fails in the closed position. The contacts weld together from heat stress, and the element never shuts off. You'll get scorching hot air temps that can damage clothes or trip the high-limit thermostat. If your dryer is running too hot, replace both the cycling thermostat (3387134) and the thermal fuse as a precaution — and clean your vent system thoroughly.