| Author |
Message |
Al
Guest
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 Posted:
Wed Feb 09, 2005 9:28 pm Post subject:
repairing hair dryer |
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My boots were a little wet inside, so I put the nozzle of the blow dryer into
one. It ran okay. But when I manually shut it off after a minute or two, it
never would come back on again. Does that tell what is probably wrong with it?
If so, how to fix? Thanks.
I've taken it apart but there is no visible problem.
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Travis Jordan
Guest
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| Posted:
Wed Feb 09, 2005 9:30 pm Post subject:
Re: repairing hair dryer |
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Al wrote:
| Quote: | My boots were a little wet inside, so I put the nozzle of the blow
dryer into one. It ran okay. But when I manually shut it off after a
minute or two, it never would come back on again.
|
Assuming the power cord, GFI and switch are OK, you probably blew a
thermal fuse that protects the heater elements from overtemperature.
Normally when this happens the blower will still run but the dryer won't
heat up. |
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Kevin R
Guest
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| Posted:
Wed Feb 09, 2005 9:44 pm Post subject:
Re: repairing hair dryer |
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"Travis Jordan" <no.one@no.net> wrote in message
news:a0qOd.1327829$B07.191824@news.easynews.com...
| Quote: | Al wrote:
My boots were a little wet inside, so I put the nozzle of the blow
dryer into one. It ran okay. But when I manually shut it off after a
minute or two, it never would come back on again.
Assuming the power cord, GFI and switch are OK, you probably blew a
thermal fuse that protects the heater elements from overtemperature.
Normally when this happens the blower will still run but the dryer won't
heat up.
not with my ones once it has blown a thermal fuse its dead |
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Travis Jordan
Guest
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| Posted:
Wed Feb 09, 2005 10:17 pm Post subject:
Re: repairing hair dryer |
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Kevin R wrote:
| Quote: | not with my ones once it has blown a thermal fuse its dead
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Sounds like that is the most likely cause, then. |
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Al
Guest
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| Posted:
Wed Feb 09, 2005 11:07 pm Post subject:
Re: repairing hair dryer |
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On Wed, 09 Feb 2005 15:44:21 GMT, "Kevin R" <dontemailme@ntlworld.com> wrote:
| Quote: | not with my ones once it has blown a thermal fuse its dead
|
wow, thanks to both for the quick replies. Here is a photo:
http://img233.exs.cx/img233/6205/fuse7sh.jpg
I had noticed what looked to be a bi-metal circuit breaker and another axial
component that I took to be something like a diode. But the 'diode' must
really be the thernal fuse, right?
So, I just used alligator clips to bypass the fuse and the dryer now works. Is
the other component (the block-like one in the right of the photo) a circuit
breaker?
What are the odds of me buying a thermal fuse locally? Or is it likely to be a
case where a $1 part needs to be ordered online, with $10 shipping. The fuse
looke to be green, with a white tip. |
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Travis Jordan
Guest
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| Posted:
Wed Feb 09, 2005 11:29 pm Post subject:
Re: repairing hair dryer |
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Al wrote:
| Quote: | What are the odds of me buying a thermal fuse locally? Or is it
likely to be a case where a $1 part needs to be ordered online, with
$10 shipping. The fuse looke to be green, with a white tip.
|
If you are really in love with the hair dryer, I'd stop by a local
Salvation Army / Goodwill store and pick up the cheapest $2 hair dryer
they have, and cannibalize the part. You'll probably want to crimp
connect the new fuse (don't solder it in, for obvious reasons, unless
you have REALLY good heat sinks). |
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Bob Shuman
Guest
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| Posted:
Thu Feb 10, 2005 2:40 am Post subject:
Re: repairing hair dryer |
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I have purchased these thermal fuses retail from Radio Shack for a couple
bucks each. They usually have two critical ratings that you will need to
use to find a substitute part. The first is a standard current limit which
will be in Amperes and he second is a temperature limit, usually expressed
in degrees centigrade. You rarely can match both exactly, so just get as
close as possible without going over the previous values to retain the
designed safety margins. If you can't get anywhere close, ask them to see
the special order catalog or find a suitable replacement part on the web.
Bob
..
"Al" <none@no.com> wrote in message
news:420c4229.8421148@news.individual.net...
| Quote: | On Wed, 09 Feb 2005 15:44:21 GMT, "Kevin R" <dontemailme@ntlworld.com
wrote:
not with my ones once it has blown a thermal fuse its dead
wow, thanks to both for the quick replies. Here is a photo:
http://img233.exs.cx/img233/6205/fuse7sh.jpg
I had noticed what looked to be a bi-metal circuit breaker and another
axial
component that I took to be something like a diode. But the 'diode' must
really be the thernal fuse, right?
So, I just used alligator clips to bypass the fuse and the dryer now
works. Is
the other component (the block-like one in the right of the photo) a
circuit
breaker?
What are the odds of me buying a thermal fuse locally? Or is it likely to
be a
case where a $1 part needs to be ordered online, with $10 shipping. The
fuse
looke to be green, with a white tip.
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Travis Jordan
Guest
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| Posted:
Thu Feb 10, 2005 3:10 am Post subject:
Re: repairing hair dryer |
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Bob Shuman wrote:
| Quote: | I have purchased these thermal fuses retail from Radio Shack for a
couple bucks each.
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Great information...I had no idea that RS carried these.
The choices seem to be 128, 141, or 228 degrees (C). If I were the OP
I'd take the lower rating which is 262 F. Should be "safe enough". |
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Guest
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| Posted:
Thu Feb 10, 2005 4:25 am Post subject:
Re: repairing hair dryer |
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i seem to recall this question came up only a few weeks back.
Be sure to use the correct rated fuse and don't even think about
leaving it bridged! |
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Al
Guest
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| Posted:
Thu Feb 10, 2005 4:36 am Post subject:
Re: repairing hair dryer |
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On Wed, 9 Feb 2005 14:40:51 -0600, "Bob Shuman"
<reshuman@removethis.lucent.com> wrote:
| Quote: | I have purchased these thermal fuses retail from Radio Shack for a couple
bucks each. They usually have two critical ratings that you will need to
use to find a substitute part. The first is a standard current limit which
will be in Amperes and he second is a temperature limit, usually expressed
in degrees centigrade.
|
thanks. But I haven't been able to find a guide to the color ratings (on the
web or in tbis group's archives), so as to know what temp I need. (It's
apparently purple/lilac with white tip.)
While on the subject, here are some recommendations for the faq, from an
amateurs point of view (having never heard of "thermal fuse" until today):
I had already read the faq's section on hair dryers before posting. It
mentions "thermal protector" but not thermal fuse. The thing that eventually
surprised me about this dryer is that there is not only a bi-metallic
protector, but *also* a thermal fuse in series.
Also, in the reverse, the section on thermal fuses does mention hair dryers.
But a following section ("More on thermal fuses") gave me the impression they
are all of some spring type. The one in my dryer is the kind pointed out here
by Bob as being at RS, that look something like an axial diode. |
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Sam Goldwasser
Guest
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| Posted:
Thu Feb 10, 2005 4:47 am Post subject:
Re: repairing hair dryer |
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none@no.com (Al) writes:
| Quote: | While on the subject, here are some recommendations for the faq, from an
amateurs point of view (having never heard of "thermal fuse" until today):
I had already read the faq's section on hair dryers before posting. It
mentions "thermal protector" but not thermal fuse. The thing that eventually
surprised me about this dryer is that there is not only a bi-metallic
protector, but *also* a thermal fuse in series.
Also, in the reverse, the section on thermal fuses does mention hair dryers.
But a following section ("More on thermal fuses") gave me the impression they
are all of some spring type. The one in my dryer is the kind pointed out here
by Bob as being at RS, that look something like an axial diode.
|
I'll add some clarifications.
Thanks.
--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html
Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.
Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs. |
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Guest
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| Posted:
Thu Feb 10, 2005 5:31 am Post subject:
Re: repairing hair dryer |
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I have seen this and repaired it by replacing the part from an
identical broken unit. Looking at a couple dryers in my house they have
both the resetting thermal bimetalic type that resets after the unit
goes over temp but then you also see the thermal fuse. Is it there
because of reliability issues with the bimetal part? If so then it may
have blown because the bimetal is faulty and (if you're like me and use
it to shrink heat shrink) it may blow again. BTW I got a real heat gun,
much better!
Richard |
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Ken Weitzel
Guest
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| Posted:
Thu Feb 10, 2005 8:41 am Post subject:
Re: repairing hair dryer |
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Jim Adney wrote:
| Quote: | On Wed, 09 Feb 2005 17:07:51 GMT none@no.com (Al) wrote:
What are the odds of me buying a thermal fuse locally? Or is it likely to be a
case where a $1 part needs to be ordered online, with $10 shipping. The fuse
looke to be green, with a white tip.
The color is no help, but sometimes there is a number on them which
might be the temp (but it could be in F or C.) Radio Shack used to
have 3 different temps of these.
Yours probably opened because it was sucking warm air that came back
from inside your boots and it overheated. The internal parts actually
got hottest AFTER you turned the blower off. The dryer is probably
fine. I would just replace the thermal fuse.
Yes, crimp them. Don't try to solder them.
|
Hi Jim...
Been sitting here thinking about this; how often it comes
up; the terrible risks involved; and the many things we
find these thermal fuses in. (coffee makers, electric clothers
dryers, etc)
If - and that's a big if - it sucked hot air or even suffered
an almost complete lack of air input - then why oh why didn't
the thermostat open? (yes, I know, some of you are calling it
a bimetal thermal fuse, but what the heck - it's a non-adjustable
thermostat, right?)
I opened one of my grandkids to read the temperature rating
for the fellow previous to this occurence - and it the
"thermostat" one was sitting open and in plain view.
It does switch pretty good current - and it is in an airflow
that's warm, probably humid, and quite likely to corrode.
That I suspect would make it pretty easy to arc; and weld
itself closed.
I'm proposing then, that for the current poster, and the
ones that are surely to follow, that it might be worth
suggesting giving it a bit of a push with something to be
sure that the contacts aren't welded shut.
Just my 2 cents.
Ken |
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James Sweet
Guest
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| Posted:
Thu Feb 10, 2005 8:41 am Post subject:
Re: repairing hair dryer |
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"Jim Adney" <jadney@vwtype3.org> wrote in message
news:dgql015vde47meuiv6k69mjrom304l6ibo@4ax.com...
| Quote: | On Wed, 09 Feb 2005 17:07:51 GMT none@no.com (Al) wrote:
What are the odds of me buying a thermal fuse locally? Or is it likely to
be a
case where a $1 part needs to be ordered online, with $10 shipping. The
fuse
looke to be green, with a white tip.
The color is no help, but sometimes there is a number on them which
might be the temp (but it could be in F or C.) Radio Shack used to
have 3 different temps of these.
Yours probably opened because it was sucking warm air that came back
from inside your boots and it overheated. The internal parts actually
got hottest AFTER you turned the blower off. The dryer is probably
fine. I would just replace the thermal fuse.
Yes, crimp them. Don't try to solder them.
|
Probably was just the lack of airflow due to being stuck down into a boot
that did it rather than sucking hot air in the back. IIRC Radio Shack sells
two thermal fuses, try the lower temp one first, if it blows in normal use
then go with the higher one. |
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Jim Adney
Guest
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| Posted:
Thu Feb 10, 2005 8:41 am Post subject:
Re: repairing hair dryer |
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On Wed, 09 Feb 2005 17:07:51 GMT none@no.com (Al) wrote:
| Quote: | What are the odds of me buying a thermal fuse locally? Or is it likely to be a
case where a $1 part needs to be ordered online, with $10 shipping. The fuse
looke to be green, with a white tip.
|
The color is no help, but sometimes there is a number on them which
might be the temp (but it could be in F or C.) Radio Shack used to
have 3 different temps of these.
Yours probably opened because it was sucking warm air that came back
from inside your boots and it overheated. The internal parts actually
got hottest AFTER you turned the blower off. The dryer is probably
fine. I would just replace the thermal fuse.
Yes, crimp them. Don't try to solder them.
-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
----------------------------------------------- |
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