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The main problem with coffee machines is they get furred up with limescale. If you let it go too long they can stop working like this. It's not difficult to take the machine apart if you're mechanically inclined and then you can clean each part.
You should check the temperature of the water coming out from the machine when it show that is heated. If it is lower than 90 C then the thermostat inside the machine attached to the boiler is need to be replaced. If the temperature of the water is about 90C then the problem is with thermometer, and in this case is only an accesorie since the machine can faction properly and make a good espresso.