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Thermal fuse / vent ducting

I have the Maytag MEDEX655DW1, 2 years old.  Dryer quit running and I found the thermal fuse was blown; replaced it, hit start and it ran. I immediately stopped the unit and hook back the vent duct and started to dry a load.  When I came back to check the top of the unit was scorching hot so I turned the unit off. I unplugged and unhooked the unit from the vent duct and cleaned / vacuumed all lent throughout.  I then ran the unit unhooked from the vent for about 30 minutes on high heat measuring the temperature from the center of the exhaust. The temp built to 142 degrees and I was satisfied so I hooked vent duct back up and I ran a load on air fluff.  The temperature had heat in it.

The unit is installed on a interior wall about 8’ from a exterior wall. The duct flows through the floor and is the flexible foil type and does not reach the exterior of the house or have a cover on the end under the house. I ran a brush through the vent from the inside and saw it reach the other end.  I plan on replacing the duct today but my question is would that be the reason for the overheating and why would it heat up on air fluff?

…after all that I decided to stop all drying till I replace vent duct and test again then my wife decided to run a load on high heat and the fuse blew again…

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Hi @bobbyj2x4

If the thermal fuse is operating it means that the hi-limit thermostat - part #15 bulhead parts isn’t operating to prevent the dryer from overheating. The thermal fuse is the safety backup in case the hi-limit thermostat doesn’t operate.

There is also an internal bias thermostat (part #8 in link above) that should regulate the dryer temperatures that you may want to look at as well

These quotes are from the parts supplier:

This thermal cut-off prevents the dryer from overheating when the dryer high limit thermostat fails in a closed circuit condition

This high-limit thermostat acts as safety mechanism to keep the dryer from overheating. Once the dryer temperature reaches 221 degrees Fahrenheit, this piece will shut down power to the heating element until it drops by 80 degrees Fahrenheit. Once the temperature decreases, the thermostat will restore heat in the dryer.

Hopefully this is of some help

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Bobby sera éternellement reconnaissant.
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