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Electronic Kettle Not Turning Off MiracleMAX
Our electronic kettle at home had slowly been getting worse – not shutting off when it should. Some electronic kettles use a ‘sterile’ feature, where the kettle will boil for an extended period of time to ensure the water has been sterilized, but this was not the case with this kettle.
It just liked to keep boiling and boiling and boiling!!!
Now it was clear that it was not a power issue as the kettle would boil and variable temperature settings would work – sort of…..
After checking on the internet, it was found that this seemed to be a common problem with this and other brands.
Disassembly included a Tri-Wing safety screw which was removed using a tool that came with an iPhone touch screen replacement kit. Stay tuned for that repair in a future article!
Unfortunately, I couldn’t find a schematic or anything similar, so checking the basics seemed a logical diagnostic path to start with. The circuit is made up of 2 IC’s, a series of resistors, an electrolytic capacitor and a touch pad switch system. I felt there was no need to check the power supply side of things as the kettle was powering up OK and the fault was not occurring in this area.
After testing the NTC resistors, the series of SMD resistors checked out OK. It looked like it might be an IC fault, but before checking all the voltages and outputs at these components, a single electrolytic capacitor needed to be tested.
Using the Blue Ring ESR Meter, the 10uf 25 volt capacitor registered a reading of 2.6, far above the maximum reading of 1.5!
As usual, I decided overkill was the best answer to this problem. I had in stock a 10uf 63 volt capacitor, which soldered nicely into place.
It was noted that the base used a series of contact points to provide continuity from the high voltage supply to the element used to heat the water. While the kettle was in bits, it seemed like a good idea to clean all the contact points with an eraser to remove any oxidation.
After assembly, there was only one thing left to do – boil the kettle. A nice cuppa is the reward of hard work and now the kettle shut off when it was supposed to.
Now, where are the tea bags kept………?
If you are interested in a video of this repair, please follow the link below:
This article was prepared for you by Mark Rabone from Australia.
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Note: You can check out his previous repair article below: