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2 Amp With 130 Degrees Thermal Fuse Replacement

By on March 3, 2022
heating device repair

 

 

 

 

 

 

 

A doctor and a friend of mine brought this device for repair. The customer explained that while the heating device was up and running it stopped working and it was not due to an electrical issue in the house.

how to fix heating device

It is a one unit device, just plug into power, choose the right setting and let the heating/cold air flow.

In this case it was completely dead and as seen in the photo there is no sign of life into it.

how to repair house heater

I took the cover off for further check up and by visual inspection I could not see anything wrong with it.

house heater circuit board repair

It was very clear to me that this device was opened before because if you look to the screws they are not fully tightened.

The customer explained that he took it to a technician but it was not repaired.

how to fix a broken house heater

The first logical thing to do is to check for any voltage going inside the machine and as seen in the photo, the device was getting the right voltage but for some reason, it was not powering on.

bad thermal fuse in transformer

I traced the power rail all the way to this transformer and it was getting the 220 AC volts but it was not producing the 12 AC volts to power on the device. So I found the fault but now I need to find a replacement.

2 amp 130 thermal fuse

I could not find any replacement for this step down transformer but I found a way to get it up and running again. When I flipped the transformer to the other side I could find the thermal fuse in there and my hope was to see this fuse open because I have plenty of these fuses available in my shop.

checking thermal fuse

So my expecting and my hope came true as I tested this thermal fuse and as seen, it was open and that put a smile on my face.



I was hoping that this was the only fault in this device so I replaced it and hoped for the best.

bad thermal fuse in transformer

how to fix a broken heater

It was a 2 amp with 130 degrees thermal fuse so I went ahead and replaced with a brand new one, added an isolation tape on top and I re soldered it on board.

how to repair a house heater with no power

Mission Accomplished.

waleed

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.

Note: You can check his previous article on Found 4 Faulty Components In A Battery Charger

 

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14 Comments

  1. Parasuraman S

    March 3, 2022 at 8:50 pm

    Blowing of thermal fuse is an indication that the TX is over heating and might fail again. Hope you took reading of it so that you can go for a replacement later, if found necessary. Many times, when the primary winding opens, and there is no writing of output voltages, we may have to guess and fix a replacement.

    Likes(7)Dislikes(0)
    • Waleed Rishmawi

      March 3, 2022 at 10:22 pm

      Parasuraman: yes I did take a note of it but so far it is up and running according to the customer so we are ok there. have a blessed day

      Likes(2)Dislikes(0)
  2. Albert van Bemmelen

    March 3, 2022 at 9:22 pm

    Like Parasuraman's reply with concern about replacing the thermal fuse, I hope you did check the temperature of the transformer and also the current through the primary coil? Still odd that you this time didn't find a good and simple replacement transformer since you most of the time do have lots of parts in stock.

    Likes(4)Dislikes(0)
    • Waleed Rishmawi

      March 3, 2022 at 10:25 pm

      Albert: yes I Understand his concern and according to the customer, the device is still up and running no problems there. yes, I did not find a replacement for the transformer and that is not odd since I do not deal with such devices on a regular basis. have a blessed day

      Likes(1)Dislikes(0)
  3. Hector De La Torre

    March 3, 2022 at 9:54 pm

    were do you check the 12v out on the transformer?

    Likes(1)Dislikes(0)
    • Waleed Rishmawi

      March 4, 2022 at 6:35 pm

      Hector: at the output of the pins of the transformer. observe where the input comes in and on the other side of the transformer is the output. have a blessed day

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  4. Henrique J. G. Ulbrich

    March 3, 2022 at 11:12 pm

    Good job, Waleed. You were lucky that you got to the thermal fuse easily. I dealt some years ago with the same problem, but in my case, the thermal fuse was immersed in the transformer windings, in such a way that any attempt to reach it could destroy the transformer with certainty. The solution was to replace by another transformer, however without the thermal fuse. There was not at that moment any other way to restore the device (a sound mixer).

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    • Waleed Rishmawi

      March 4, 2022 at 6:38 pm

      Henrique: thanks man. they are usually on the top of the windings but you still have to be carefull with taking it out, the wires are very sensitive and you might end up cutting the winding off. have a blessed day

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  5. Mike Retz

    March 4, 2022 at 3:02 am

    Hi. Replacing the small fuse with a 2 amp fuse is not a good idea. Thermal fuses detect the temperature of a device and if that temperature exceeds the rating of the fuse it will open the circuit. A 2 amp fuse would not open until the 2 amp rating is exceeded and would allow the defective transformer to exceed it's maximum operating temperature. Possibly causing a fire. If that caused personal injury you could be held liable. On other hand if at least replacing with a 2 amp fuse to help out a disabled person and you feel confident the transformer is ok you did the right thing. Often fuses are hard to identify and also can be difficult to get replacements for. In these difficult times you did the right thing. ! May God bless our country's✌✌

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    • Waleed Rishmawi

      March 4, 2022 at 6:42 pm

      Mike: I replaced it with the exact fuse specs that was found inside the transformer I do not see why it is not a good idea. any way, the device is up and running up to this minute and seems like all is well. have a blessed day.

      Likes(1)Dislikes(0)
  6. hadiprodjo hartono

    March 4, 2022 at 10:49 am

    Good Job Sir, but I have a question. This thermal fuse is intended to protect the transformer from overheat, and already do its job nicely. Do you make observation why the transformer become so HOT? When you don't observe and fix the real source of heat, I am sure it will happened angain in future.
    Best Regards
    Hartono

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    • Waleed Rishmawi

      March 4, 2022 at 6:44 pm

      Hadiprodjo: thank you. yes, you are right about the fuse. I usually test out the device before sending it back to the customer and it was up and running. according to the customer who picked up a while ago it is still up and running. have a blessed day

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  7. Yogesh Panchal

    March 4, 2022 at 7:30 pm

    Good Job Waleed,

    Likes(1)Dislikes(0)
    • Waleed Rishmawi

      March 5, 2022 at 2:57 am

      Yogesh: thanks man. Have a blessed day

      Likes(0)Dislikes(0)

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