Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Appliances and other Household Electronic Stuff
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 12-07-2022, 02:33 PM   #21
CapLeaker
Leaking Member
 
CapLeaker's Avatar
 
Join Date: Dec 2014
City & State: Atlantic Canada
My Country: Canada
Line Voltage: Ground, 0Hz
I'm a: Hobbyist Tech
Posts: 5,558
Default Re: Drying Oven - Preset Temp Fail

Quote:
Originally Posted by redwire View Post
I don't get the fuse box affecting the heating element. Usually there is high temperature wire/spade connectors from the heating element to the control circuit, and then that goes to the fuse.
Corrosion I find causes hot spots whichs melt things such as PVC wire or switches etc.
All I can tell you it was one of the old screw in fuses with the fuse block that needs to be inserted in the panel. The fuse was hot and there was some arcing going on between the blocks fingers and the bars inside the box. I think I exchanged the upper heating element 3 times until I got it. After that my dryer started popping fuses. Same corrosion on the fuse block and arcing to the bars. Must be the very high humidity we have.
CapLeaker is offline   Reply With Quote
Old 12-07-2022, 04:20 PM   #22
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 28,106
Default Re: Drying Oven - Preset Temp Fail

if the element is not plated with something like nickel and is pure copper then it can develop tiny pinholes in the surface,
combine that with moisture and the internal winding can rust and bridge to the copper shell.
very common in imersion water heaters - the rust will build up until the pressure splits the copper open if you dont have an RCD breaker on it!
stj is offline   Reply With Quote
Old 12-07-2022, 05:24 PM   #23
redwire
Badcaps Veteran
 
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 2,983
Default Re: Drying Oven - Preset Temp Fail

These heating elements expand so much when hot, that the wire gets longer and can push through the MgO and short. I think most failures are thin spots in the wire element which run super hot and expand too much, short to the tube or just go open-circuit.
They seem to be NiCr or Kanthal wire inside. I don't believe the (oven) moisture problem because it's near impossible to get enough past the end seal and inside the tube, to corrode the element so badly. MgO is hygroscopic though.
Tubular heating elements data.

Immersion hot water water heating elements, I've seen the sheath get covered with mineral deposits and develop hot spots. Or corrode and micro leak inside.

With clothes dryers, the heating element is open coil? I find if the vent is not connected, duct not sealed good or partially blocked- it blows the moist air into the dryer and laundry room. Lots of lint dust too. It might be what is eating the fuse blocks, unless you live seaside or something.
redwire is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums © 2003 - 2023
Powered by vBulletin ®
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 07:39 AM.
Did you find this forum helpful?