Whirlpool Duet Gas Dryer Not Heating | Thermal Fuse Replacement

Our Whirlpool Duet dryer is not heating, it starts, spins, blows air but without heat, and no error displayed. Let’s open it up and see what we find…

0:00 Intro - Whirlpool dryer not heating
0:24 Unplug the dryer and opening it up
0:47 Removing Thermal Fuse, Thermistor and Lint Trap
2:25 Shop-vac loose lint clean-up
2:59 New parts and testing old parts
5:25 Installing new Thermal Fuse and Thermistor
7:34 Testing the dryer to see if it's fixed
9:01 Replacing lint trap foam gasket
12:45 Back in business drying clothes

--------- Before you get started UNPLUG the dryer ---------

I use a 1/4” nut driver to remove 4 bolt-head screws just above my drawer pedestal. If you don’t have the pedestal these will be a little tougher to get at. Some dryer models may only have 2 bolt-head screws holding the front cover in place.

Inside we have easy access to the gas solenoids, but I suspect that mine are ok (even though I ordered a replacement set just in case). To get easier access to the Thermal Fuse and Thermistor, I remove the metal lint trap (4 more 1/4” bolt-head screws).

Before removing the wires to the Thermal Fuse and Thermistor, I label the wires, and then gently pull the connectors until they release. These were very tight fitting, be careful not to force or break them to get them off. The Thermal Fuse is attached with a single 1/4” bolt-head screw, because of limited space I use a 1/4” box-end wrench to remove this and the two screws holding the Thermistor.

Next step is to test these parts on the bench with our multimeter.
The Thermal Fuse can be tested with continuity, our old fuse is certainly bad. This part at time of repair cost me $5.19 on Amazon!
The Thermistor is tested with ohm resistance, and our old one looked to be nearly the same reading as the new one I ordered. As a precaution we’ll drop the new one in while we’re here. At time of repair this was $7.97 on Amazon.

The likely cause of my Thermal Fuse failure is build-up in the dryer vent line, so I did a thorough vacuuming of the lint trap and vent pipe and will be replacing my flexible vent line this weekend with a rigid metal vent pipe.

Before putting everything back together, I also replaced the foam gasket around the fan on the lint trap. Mine had partially disintegrated and was allowing lint into the dryer interior (not good).

Parts ordered:
Thermal fuse https://amzn.to/3BultXW
Thermistor https://amzn.to/2YeiRzh
Lint trap foam gasket https://amzn.to/2WEbmAE
Gas valve solenoids (didn’t end up installing) https://amzn.to/3Dxxgqe

Tools used:
Nut Driver
1/4” socket (1/4” drive)
1/4” box-end/open-end wrench
Milwaukee M12 LED light stick https://amzn.to/3qBVpqc
Milwaukee M12 Battery https://amzn.to/3Jteu6l
Shop-vac https://amzn.to/3jyIcfC
Multimeter https://amzn.to/3jz2xB6
Silicone caulk as adhesive for the foam gasket
Putty knife

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