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Old 04-04-2019, 09:21 PM   #16
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Re: What would cause an electric dryer to blow the main (not thermal) fuse?


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Originally Posted by DanS26 View Post
OP......have you checked the sag on the heating coils?
I'm surprised I have not received a response from the OP.

Sag on the coils will create the conditions the OP described.

So I'm posting again so that those DIY'ers that come across this problem of intermittent breaker trips on an electric dryer would check it out.

It's not intuitive.....you have to disassemble the dryer to find the problem.
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Old 04-17-2019, 01:40 PM   #17
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Re: What would cause an electric dryer to blow the main (not thermal) fuse?


Quote:
Originally Posted by DanS26 View Post
I'm surprised I have not received a response from the OP.

Sag on the coils will create the conditions the OP described.

So I'm posting again so that those DIY'ers that come across this problem of intermittent breaker trips on an electric dryer would check it out.

It's not intuitive.....you have to disassemble the dryer to find the problem.
Thanks Dan, I appreciate the info.

Well, the update is my friend replaced the fuse a couple of times and the last time the fuse housing was actually melted! I thought the fuse was supposed to blow before that?

Anyway, she ordered a new housing and I put it in and it has been working but obviously there is another problem. If this was my dryer, I would have junked it but now I want to find the problem. It was not worth the $40 bucks she spent on the housing let alone all the trouble. But now I want to know (and fix it) for my own knowledge.

I assume I can access the heating coils by taking off the back panel? And by "sag" do you mean they are literally sagging and making a short circuit situation when in use? What would cause this on a fairly new dryer? I know the heating elements go bad but what is, and what causes, coil sag?

Again, thanks for the information, my friend.
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Old 04-17-2019, 02:34 PM   #18
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Re: What would cause an electric dryer to blow the main (not thermal) fuse?


Normally the coils on an electric dryer are accessed by taking the front off and removing the drum.

Many YouTube videos on the how to disassemble dryers.

The sag is caused be the red hot coils drooping under there own weight when energized causing a short. Most of the time the coil is destroyed, but sometimes it will cause a short to trip the breaker but not break the coil. Then the coil cools and retracts. This can be an intermittent process.

It can affect even new machines if the coils are not properly installed at the factory. Only way to tell is to disassemble the machine and look for drooping coil segments.

Good luck.
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Old 04-17-2019, 02:55 PM   #19
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Re: What would cause an electric dryer to blow the main (not thermal) fuse?


it could also be cause by loose fusible in the fuse housing creating a loose connection (or loose connection to the fuse housing) and a lot of heat that transferred to the fuse itself causing it to blow even if under 30A load
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