How to troubleshoot and replace a thermal fuse

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Күн бұрын

Has your electric heater or other appliance gone cold? Check out this helpful video and see how to get it heating up again. The thermal fuse, or cut-off, is a protective device that may be the problem.

Пікірлер: 73

@emeralddragon2010 2 жыл бұрын

solder melts at a lower temp than the thermal fuse. the heat shrink also burns at a lower temp. good video on what not to do

@briangutierrez5908 3 жыл бұрын

Very helpful! Thank you. I'm trying to fix a coffee grinder and I think that this is why it stopped working.

@debbiejans1348 4 жыл бұрын

I am replacing the thermal fuse on a toaster oven. The previous fuse burned completely. Comments below are great. The original spade clips are reusable, but what can I use to insulate the connection? I don't have any fiberglass wire insulation left. Do I cover the entire connection or just the fuse? Good stuff, people. Best video so far on this topic.

@johndowns7536 17 күн бұрын

I just had mine fail in a toaster oven, I wired around it rather than replace. Only ghetto dwellers let their appliances overheat, its lack of maintenance. These fuses are designed to fail in a few years, 90% of people junk the item. Good for business.

@bgregg55 3 жыл бұрын

Millions of small appliances end up in the landfills every year due to these non-resetting thermal fuses. It's a frickin' crime. Most fail well short of ever reaching their rated temp. That's exactly the way manufacturers like it.

@Kryptoz Жыл бұрын

My Hedge trimmer keeps cutting out - 2 kind of fuses inside - may try and replace. Makers don't seem to care - just expect you to buy another and ignore climate change.

@johndowns7536 17 күн бұрын

I agree, its a ripoff. I just had mine fail in a toaster oven, I wired around it rather than replace. Only ghetto dwellers let their appliances overheat, its lack of maintenance. These fuses are designed to fail in a few years, 90% of people junk the item. Good for business.

@seanjohn2381 2 жыл бұрын

That was very helpful. I will not have to throw out my heater

@gordonconner7667 7 ай бұрын

Good job THANKS

@w77videos 2 жыл бұрын

Thank You very much..

@bodeine454 5 жыл бұрын

I was trying to diagnose a milk house heater that was shutting off and not coming back on a couple of years ago. It has those bi-metal contact points in it which is what I thought was wrong with it but looking at this video I'm thinking that maybe it's a bad thermal fuse. I didn't know it also had a thermal fuse, I thought that the contact points was the thermal fuse itself. Now I'm rethinking it and am going to check the thermal fuse. I remember trying to find the bi-metal contact points online without much luck.

@ahgsamsung3245 Жыл бұрын

Good one

@ShamsherNawaz 2 жыл бұрын

Good one. Very informative and helpfull video. I have some questions. > Where can I buy these fuses in Canada and what cost > Possible to replace it with resetable fuse.

@TheOriginalMechanic 2 жыл бұрын

I don't know about Canadian retailers. It used to be Radio Shack would have things like this but they're out of business. I got mine on the internet. Resettable? Yeah, why not.

@themaritimegirl 6 жыл бұрын

I've got a heater just like that one, except the thermostat is in the front instead of on top. It's called an Eaton Viking (Eaton was a department store chain here in Canada) and was made in 1968. :)

@Dimbochan 2 жыл бұрын

Can anyone provide a source where to order a replacement fuse, the specs or the part number for this fuse for the Lasko 20" box fan?

@sanamughal5681 3 жыл бұрын

I have a philips air fryer. The problem when i plug in in instant starts fan and heater. Disply button not working just biinking. Sound like tik tik comming from pcb contacter rely. Whats the problem

@watcher818 7 жыл бұрын

Hello David, great video. However with all due respect, the soldering job is not quite 100% proper. Solder is not the main component in adhering 2 wires together, so it is not just the ac of putting some solder on both, then 'sticking together. Sore it may hold up but the connection could be better. The best connections is to mechanically put the wires together, first. Either a twist, or a bent hook and crimp on both wires first. That joint alone is pretty strong in itself, but not fully reliable. Applying the solder fills the minute spaces between your joint's wires for a solid connection. Any of the old timers will say that the mechanical connection first, then filling in gaps left, is the way to have a joint stronger than the wire itself. Please don't take this in the wrong way, I just wanted to pass this on to you, or others that see the video. There is a crimped fastener that sometimes comes with the thermal fuse. This is ideal to get a strong hold on the wires, Some will still leave this crimped connection bare, others will then solder it. Thank your the nice video sir.

@TheOriginalMechanic 7 жыл бұрын

Thanks for watching and taking the time to share these helpful details.

@cmuller1441 6 жыл бұрын

The Original Mechanic Thermal fuses are supposed to attached with crimping not soldering. First because you could overheat them and destroy them when soldering the wires, second because the solder join may become soft at high temperatures causing a bad connection creating resistance and heating the solder even more then melting it and creating a mess inside a device that is on...

@defiantlion231 4 жыл бұрын

Crimp the thermal than solder, too shut both of you 2 TFU! If he would of blown the fuse then the appliance wouldn't have started right up! And twisting wires guy, if you look it's 1 solid wire, you don't want to twist this sort of thermal cutoff axial fuse. Yeah I'd go with crimping just because it's a fuse. Now we got to find the crimps for this, these type of items are not like walking into a store & buying a beer!

@stonekold 5 жыл бұрын

what is you wanted to change your thermal fuse to a thermal switch? I have a thermal fuse has TF 230C on it but can only find switches up to 145C. example the KSD9700 max out at 145 degrees C.

@moonrich3492 5 жыл бұрын

Beware. A thermal fuse that blows provides protection against fire. A thermal switch can recycle on and off until you get a fire! The lower temp rating of the switch simply means it'll open when the temp reaches 145 C and then cycle on and off to maintain roughly 145 C. This is NOT the same as a 230 C fuse that will blow if the fuse temp reaches 230 C. The higher temp can be reached due to a combination of the 145 C in the vicinity and the resistance of the fuse itself.

@marty-fh1rw 6 жыл бұрын

I have a fanless convection heater.The mechanical thermal cut out keeps activating.I cant see anything that would cause it.The heater cycles through this after sparking from there.I decided against bypassing it.Thanks.

@nonelost1 3 жыл бұрын

Wise decision not to bypass it as a permanent fix!

@akepatinagaraju8564 2 жыл бұрын

Sir thermal cutoff series connection can be or can't 128c 229c plz?

@chriscarley3323 4 жыл бұрын

Any idea where to get a thermal fuse these days? June 2020? Only found a strange foreign site with $20 shipping? Radio Shack is out so any other places? I am looking for a SW-104T fuse.

@TheOriginalMechanic 4 жыл бұрын

I think I found mine on ebay. Otherwise Newark Electronics or Digikey carry about everything imaginable in the field.

@user-pe1wu9zb4x Жыл бұрын

Hi , if a thermal fuse is rated 175degrees , in a heat gun, of the temperature inside it is between 170degrees to 175 degrees, would not the solder melt?

@TheOriginalMechanic Жыл бұрын

The melting point of solder is much higher than that, upwards of 300 degrees as I recall.

@BrendonHoppy 4 жыл бұрын

Does it matter which polarity, we test the thermal fuse? I get continuity in one direction and the other way round,,- nothing

@TheOriginalMechanic 4 жыл бұрын

Thermal fuses have no polarity

@glenlockyer775 3 жыл бұрын

If you have continuity one way and not the other it isn't a thermal fuse! It's a diode!

@williammchugh4361 6 жыл бұрын

I have one of those portable fireplace show heaters. Most the time it works fine and we only run it on low 750 watts. Randomly, the heat element and fan will stop while the "light show" continues. If you turn the heater off for around 5 minutes, you can hear a click inside. Restarting the heater makes it run correctly until the next time it randomly does this again. It may be a few hours or days when this happens again. Could this be a faulty thermo switch? I find it hard to believe the unit is actually overheating, it's been taken apart and cleaned out. Its operating at 750 watts in a cool room.

@TheOriginalMechanic 6 жыл бұрын

It does sound like it could be a re-settable thermal overload that's not working right.

@10yoss 4 жыл бұрын

If you put shrink tubing around the thermal fuse you are modifying its ability to cutoff at the correct temperature because the shrink tubing is acting as an insulator.

@TheOriginalMechanic 4 жыл бұрын

This old unit is still heating well several years later.

@10yoss 4 жыл бұрын

@@TheOriginalMechanic It may be so, but I would not take a chance. A thermal fuse plays an important role to avoid a fire if the unit overheats. Shrink tubing around the fuse will result at a power cutoff at a higher temperature...It is a gamble in my opinion.

@TheOriginalMechanic 4 жыл бұрын

@@10yoss Makes sense. Hadn't thought of that. Thanks for the tip.

@sanamughal5681 3 жыл бұрын

My air fryer is has a problem when i plug in it instant strt fan and heater. Display birton are not working just blinking and tik tik sound comming from contector rely. What the problem

@justinianpescador280 2 жыл бұрын

Does it matter which way the the thermal fuse is positioned

@realtrickybilly 6 жыл бұрын

I am very new to electronics (only as a hobby, not my profession). Questions: 1) why is one end of the fuse shorter then another? 2) is it important how you connect it - "which way" should the "sharper" end face? 3) I would like to blow it that I connect some 9V battery to an LED via a resistor with having this fuse in the circuit. Using a lighter I would heat it up above 94*C. Any precautions maybe? I would probably use alligator clips for connecting the fuse to the linear circuit or maybe just some copper wire because I fear the clips will also overheat and maybe melt their rubber part. Fuse type: SEFUSE, sf90r0, 94*C, 15A

@TheOriginalMechanic 6 жыл бұрын

I haven't seen a new thermal cut-off with one lead shorter. It must have been cut that way to fit. It doesn't matter how you connect as there is no polarity. Your experimental circuit has me??? Thanks for watching.

@Fucknuts4u 5 жыл бұрын

@@TheOriginalMechanic - Yes, it does matter which way it's connected, the cone end of the fuse part faces toward your power source. Also, soldering a thermal fuse is a great way to blow your fuse unless you take certain precautions, which you didn't.

@alphatechrefrigeration3983 4 жыл бұрын

I could tell by the construction that it had to be directional but was unsure of its orientation. And you are absolutely 100% correct soldering a thermal fuse is not a good idea. I typically don't replace very many of these and when I do they come in some sort of housing. Thank you!

@etownsterguy9489 Жыл бұрын

@@Fucknuts4u "cone end of the fuse part faces toward your power source." Not in my rice cooker!

@winstonclarke9221 6 жыл бұрын

Good video, ? does this type of thermal fuse have to solder in any particular direction,

@TheOriginalMechanic 6 жыл бұрын

No it does not. There is no polarity. Thanks for watching.

@stevenA44 3 жыл бұрын

DON'T SOLDER a thermal fuse! That's just plain STUPID!!

@andrewrwk 6 жыл бұрын

I did see that you used solder on the fuse. I just want to make sure that with that temperature from the soldering iron it wont set off the fuse before its even in place.

@TheOriginalMechanic 6 жыл бұрын

I don't think the heat from the iron transfers quite fast enough to get to the fuse. It isn't a bad idea,though, to insert a clip near the solder point to take away some of the heat before it can reach the fuse.

@moonrich3492 5 жыл бұрын

@@TheOriginalMechanic Anything more than about 1 sec of high temp (300 C+) solder tip contact will blow the fuse, unless, as you say, you take steps to prevent all the heat transferring to the fuse -- alligator clips, ice, etc. Many of those options will make it even harder to solder the connection properly. These connections come spot welded, not soldered, for that very reason.

@stevenA44 3 жыл бұрын

He soldered it because he DOESN'T know what he's doing! NEVER solder a thermal fuse. That's just dumb!

@hardkore360 3 жыл бұрын

@@stevenA44 FYI, there is such a thing as cold soldering as well, that wouldn't exceed the temp rating on the fuse to make it useless....

@stevenA44 3 жыл бұрын

@@hardkore360 FYI I KNOW what cold soldering is and it's garbage! I had a cold heat soldering iron and it's shit in my opinion.

@SunnySunny-vd9sy 5 жыл бұрын

Good video But i need to replace an element in my black and decker toaster-r-oven. Upper element is totally dead. Anyone has any idea? Do i need to change a Thermal Fuse?

@TheOriginalMechanic 5 жыл бұрын

First you should measure the resistance of the element with an ohmmeter. Low resistance good. High resistance replace.

@SunnySunny-vd9sy 5 жыл бұрын

@@TheOriginalMechanic Thanks

@MrDpotts2 7 жыл бұрын

Where did you get a replacement ?

@TheOriginalMechanic 7 жыл бұрын

I found it on E-Bay.

@MrDpotts2 7 жыл бұрын

Thanks. I found one at Radio Shack.

@TheOriginalMechanic 7 жыл бұрын

You're welcome. My Radio Shack never had it in stock.

@eroshtik6997 3 жыл бұрын

Can I use a 133C thermal fuse on a 130C charger?

@TheOriginalMechanic 3 жыл бұрын

That should be fine.

@eroshtik6997 3 жыл бұрын

@@TheOriginalMechanic Thank you

@akepatinagaraju8564 2 жыл бұрын

Sir thermal cutoff series connection parallel connection 128c+229c about plz

@Petrolhead66 3 жыл бұрын

So it does not matter which way the fuse goes?

@TheOriginalMechanic 3 жыл бұрын

It does not matter.

@stevenA44 3 жыл бұрын

Why are people soldering a thermal fuse? It can blow them or worse, the heat can melt the solder and then the fuse will disconnect and possibly fall and create a short/fire hazard. This is just stupid!

@davejones542 2 жыл бұрын

why do you need a thermal fuse at all. If it catches fire ?

@TheOriginalMechanic 2 жыл бұрын

The idea is that it opens up and shuts down the device before there is a fire. Of course any protective device can malfunction but this should be extremely rare.

@davejones542 2 жыл бұрын

@@TheOriginalMechanic So if there is no fire why does it fail