Dryer Would not start so checked thermal limit fuse... it was blown... replaced but did not reinstall to sheet metal since it was very tight space. Put black tape around connections. And left it hanging in the open space. I had great air flow after reinstall and heat. After one use it blew. Should I have put it bck on the sheet metal and left it untaped (no electrical tape) instead of the easier fix.? Thank

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Try this guy,

What Causes the Thermal Cutoff to Keep Going Bad on a Dryer? | Home Guides | SF Gate

Quote:

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Defective Heating Element

A number of components inside the dryer can cause overheating. The first and most obvious is the heating element itself. If it has shorted, it may stay on even when the cycling thermostat turns it off. A visual inspection may reveal that it's touching some part of the assembly casing, but if not, you should unplug the dryer, remove the heater assembly and test it for continuity with an ohmmeter. If the meter indicates very low or no resistance, the element is defective, and you should replace it.

Other Possible Defective Components

...A defective cycling thermostat can also cause the dryer to overheat if it doesn't turn off the heat at the proper temperature. If it isn't working, a continuity test will reveal infinite resistance...

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As you see an ohmmeter is a handy tool, but read the whole article.

Most issues I have seen arise from a blocked vent pipe. I just cleaned a vent, 10 ft. long, and pulled out almost 5 gallons of lint. Thermal had blown.

It NEEDS to be Mounted on the Sheet Metal(Heater Duct)so it can open at correct Heat. Some are one time use, some resettable, some automatically reset.