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paulmars

thermal cut off fuse, why?

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paulmars

Why is it needed? Ive only repaired a few dryers, but this looks like extra part. This dryer has the std High-Limit Thermostat, Operating Thermostat, and Thermal Fuse. However, it also has this Thermal Cut-Off Fuse. This Thermal Cut-Off fuse is located in the heater housing where it feeds the drum and looks more like a thermostat. Its also the most expensive part.

See attached diagram. (  https://imgur.com/a/Q3vVHeP  )

#1 Thermal Cut-Off Fuse

#34 High-Limit Thermostat

#42 Operating Thermostat

#59 Thermal Fuse

kenmore 110.96281100

tks,
pa

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Vance R

It is there to prevent overheating if the operating thermostat and/or high-limit stick closed. Check venting/ airflow, grounded element and thermostat cycling after replacing fuse.

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paulmars

Ive watched several troubleshooting videos for this specific model troubleshooting for no heat. Each video tested the High-Limit Thermostat, Operating Thermostat, Thermal Fuse, heating element. One of the videos tested the timer. None tested or even mentioned the Thermal Cut-Off Fuse.

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16345Ed
1 hour ago, paulmars said:

Ive watched several troubleshooting videos for this specific model troubleshooting for no heat. Each video tested the High-Limit Thermostat, Operating Thermostat, Thermal Fuse, heating element. One of the videos tested the timer. None tested or even mentioned the Thermal Cut-Off Fuse.

Sounds like you don’t need our help then. 
 

But if you have Children in your home I implore you not to bypass it. 

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paulmars

Before I purchase new cut off, I decided to test the two thermostats:

one is marked L155-25F. it opens at 110°F.

the other L250-80F. it opens at 180°F.

Some sites say that number after the dash is +/- for opening temperature. Other sites say that is how much less the temp needs to be for closing. I dont know which sites are correct.

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Vance R

L155-25F is a open on rise bi-metal that should open at 155 deg and should close at 25 deg below the 155 deg or 130 deg. The F means fahrenheit. Forget the +/- tolerances, believe it is usually 10%. Hard part is to measure temps at thermostat's location.  You can measure discharge temp at vent to get a general idea if dryer temps are cycling.

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