How to Replace 279973 High Limit Thermostat & Thermal Cut-Off Kit on Whirlpool & Maytag Dryers — Step-by-Step

Your Whirlpool or Maytag dryer's running, the drum's spinning, but your clothes come out damp and cold after an hour. That's the classic sign of a failed high limit thermostat or thermal cut-off. The 279973 kit includes both safety components that prevent your dryer from overheating — and when they fail, your dryer won't produce any heat at all.

This repair works on hundreds of Whirlpool, Maytag, Kenmore, and KitchenAid dryer models including the GEW9250PW0, MEDB765FW0, MED5500FW0, and WED95HEDW0. The good news? It's one of the most straightforward dryer repairs you can tackle yourself.

What You Need Before Starting

Gather these tools before you begin:

• ¼-inch nut driver or socket set
• Phillips head screwdriver
• Flathead screwdriver (for panel clips)
• Work gloves (metal edges can be sharp)
• Multimeter for testing continuity (optional but recommended)

Time estimate: 30-45 minutes for most models

Difficulty: Moderate — Requires removing panels but no specialized skills

Safety First

Unplug your dryer completely before starting this repair. If it's a gas model, turn off the gas supply valve as well. Even though you're working with low-voltage thermostats, you'll be reaching into areas near the heating element and blower housing where sharp metal edges are common. The dryer should be cool to the touch — don't attempt this repair immediately after running a cycle.

Step 1: Access the Heater Housing

For most Whirlpool and Maytag dryers, you'll need to remove the lower front panel. Open the dryer door and locate the two screws at the bottom of the door opening — these secure the lower access panel. Remove those screws and pull the panel forward and down to release it from the top clips. Set it aside where it won't get stepped on.

Step 2: Locate the Failed Components

Look at the heater housing — it's the rectangular metal box usually on the right side. You'll see the high limit thermostat and thermal cut-off attached to the outside of this housing, connected with wire terminals. They're small, round components about the size of a quarter. The thermal cut-off is the most common failure point — it blows when your dryer overheats due to restricted airflow from a clogged vent or lint buildup.

Step 3: Disconnect and Remove Old Parts

Pull the wire connectors straight off the old thermostat and thermal cut-off. They should slide off easily — if they're stuck, gently wiggle them side to side. Don't yank on the wires themselves. Remove the mounting screws holding each component to the heater housing. Keep these screws — you'll reuse them unless your kit includes new hardware.

Step 4: Install the New 279973 Kit Components

Position the new high limit thermostat exactly where the old one was mounted. The flat metal surface should make full contact with the heater housing — that's critical for proper temperature sensing. Secure it with the mounting screw. Do the same with the thermal cut-off. Now push the wire connectors onto the terminals of each new component until you feel them click into place. The terminals are designed to fit either way, so don't worry about polarity.

Step 5: Reassemble and Test

Replace the lower access panel by hooking the top edge first, then pushing the bottom into place. Reinstall the two screws at the door opening. Plug the dryer back in (and turn on the gas valve if applicable). Run a timed dry cycle with a few damp towels. Within five minutes, you should feel hot air coming from the exhaust vent. Let it run for 10-15 minutes to verify consistent heating.

Testing After Installation

After your test cycle, check these things: the exhaust air should be warm but not scalding hot, the drum should rotate smoothly without unusual noises, and the dryer shouldn't shut off unexpectedly mid-cycle. If the new thermal cut-off blows immediately, you've got an underlying problem — most likely a severely clogged dryer vent that's causing dangerous overheating. Clean your entire vent system thoroughly before replacing the parts again.

Why Did This Part Fail?

The most common cause of thermal fuse failure is restricted airflow from a clogged dryer vent. When hot air can't escape properly, temperatures inside the heater housing climb past the safety threshold (usually around 220°F for the thermal cut-off). The fuse blows intentionally to prevent a fire. Before you finish this repair, pull your dryer away from the wall and inspect the entire vent run from the dryer to the outside termination. Remove any lint buildup, check for crushed ductwork, and make sure the exterior vent flap opens freely.

Frequently Asked Questions

Will the thermal cut-off reset itself, or is it a one-time fuse?

It's a one-time safety fuse. Once the thermal cut-off blows, it's permanently open and must be replaced. The high limit thermostat, on the other hand, is designed to cycle on and off — but it can eventually fail in the open position as well, which also kills your dryer's heat.

Can I test these parts with a multimeter before installing?

Yes, and you should. Set your multimeter to continuity or resistance mode. Touch the probes to each terminal on the thermostat or thermal cut-off. A good component should show continuity (near zero ohms). If you get an infinite reading or no continuity, that part is blown. Test your old parts too — this confirms your diagnosis before you reassemble everything.

My dryer worked fine after replacing the 279973 kit, but stopped heating again after two weeks. What happened?

You've still got an airflow restriction problem. The new thermal cut-off did its job by blowing again to protect your dryer from overheating. This time, thoroughly clean your entire vent system — disconnect the vent hose at the back of the dryer and use a dryer vent brush kit to clean from both ends. Check for hidden kinks in the ductwork or a blocked exterior vent hood. Fix the airflow issue before installing another thermal cut-off, or you'll be stuck in this cycle indefinitely.