It keeps shutting off and short filling. I think I need to descale it but do not know how

This may have a short in the high voltage side, rectifier or shorted high voltage capacitor. You may find it cheaper to replace the microwave, however you do need to call a repairman.

The magnetron is the other issue, high voltage diode will sometimes crack causing a high level short, the capacitor developes a dead short across the 2 points, the power transformer almost never fails, "very rare"

Marion, mine does the same and is around the same age. Did you ever get advice regarding this. I don't use rain water, I use tap water, but same problem

There are some descaler solutions available that can be bought at supermarkets. After you use any of them please make sure that you fully fill up to the maximum level allowed with water, boil it, drain it (dont use it) twice before it can be used for usual consumption.
You can have a look here http://www.videojug.com/film/how-to-descale-a-kettle

Hello, Here is a tip i wrote, see if this helps you.



Have you ever wondered, 'how do I descale my expresso machine?' First lets us understand what is exactly is scaling. The build up of minerals inside the hot parts of your coffee machine or espresso machine is commonly called lime scale. When lime scale builds up inside the Espresso machine, it slows down the water flow, reduces the boiler capacity and can prevent your coffee machine from working properly. To keep your Espresso machine operational at full order, it is important to descale it every three months. The time intervals between descaling depend upon many factors. Quality of your water and the amount of water running through the machine are the two main factors that decide the frequency at which you should descale your Espresso machine. The more you your machine, more often should you descale it. In some cities, in conjunction with a water filter you can use your coffee machine for a year or more without descaling at all. If you use less water by drinking espressos you'll need to descale less often than if you make cappuccinos.


Descaling products are widely available from stores that sell coffeemakers and espresso machines. Be sure that the product you buy to descale your Espresso machine is intended for this specific use only. Before you descale your Espresso machine, always unplug it and make sure that it is cold. Also, never immerse the appliance in water and nor should you use abrasive cleaning products or scouring materials on any part of your Expresso machine. In case your Espresso machine does not come with a instruction guide or booklet, then use a proper citric acid based descaling solution designed for espresso machines. This should be mixed and prepared as per the instructions on the bottle or packet. Once your Espresso machine has been descaled properly you would not be left wondering, 'how do I descale my expresso machine?', treat yourself to a great cup of coffee. Some popular models of Espresso machines are Krups EA8080 Espresseria Automatic, DeLonghi Magnifica EAM3200S, Krups Nespresso CitiZ & Milk XN 7106 Fire-engine red, DeLonghi Perfecta ESAM5400, DeLonghi PrimaDonna ESAM6600, DeLonghi Magnifica ESAM4200S, DeLonghi Perfecta ESAM5500 and Magimix Nespresso Citiz M190.

In order to keep your Tassimo machine operational at full order, it is important to descale it every three months. Descaling products are widely available from stores that sell coffeemakers and espresso machines. Be sure that the product you buy to descale your Tassimo machine is intended for this specific use only. Mix the descaling product directly in the water container, following the instructions provided on the descaling packaging. Then replace the water container on the machine. Place a large cup or mug on the cup stand, insert the cleaning disc, bar code down and close the brew mechanism. As soon as the AUTO light illuminates, press and release the start/stop button. This will fill the brew cycle with descaling solution. Empty the cup and let the machine stand for 15 minutes. Then open the brew mechanism and close it again, leaving the cleaning disc in place. Repeat this step two more times for maximum descaling effectiveness.

Discard the remaining descaling agent from the water container, rinse it well and refill with fresh, cold water. Clean the machine by flushing water through it in the same manner and emptying the cup as it fills. Make sure that all the descaling solution has been completely rinsed away, and then flush two full water containers through the machine before using it again. Remove the cleaning disc, rinse and refill the water container and your Tassimo machine is ready to use. Also, before you descale your Tassimo machine, always unplug it. Also, never immerse the appliance in water and nor should you use abrasive cleaning products or scouring materials on any part of your Tassimo machine. This method works for most espresso machines, including some of these popular models: the DeLonghi Magnifica EAM3200S, DeLonghi Magnifica ESAM4200S, DeLonghi Perfecta ESAM5400, Gaggia 74507BCN Classic, Krups EA8080 Espresseria Automatic, DeLonghi PrimaDonna ESAM6600, the BC0255 DeLonghi coffee machine and the Krups Nespresso CititZ XN 7006.

It sounds like the power relay on the main control is shutting down. To fix this problem you would need to replace the control (Mother board). Before doing that the magnetron (heat element) should be tested to make sure that it is not what caused the relay to fail.

If you send me your model number I can try and get a ball part price on the parts you need.

In all likelihood the mangnetron has failed, or perhaps even the Power Supply. or a fault that is shutting the system down for safety reasons You need to have it serviced by a reputable service centre/man.
Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.

It appears like the high voltage capacitor is shorted or the diode connected to the capacitor. You might want to check the monitoring switch as well if the capacitor and diode are good.
Click here for more info on how to work around these high voltage devices.
Let me know if you need further assistance.