At the beginning, on most of these coffeemakers, the LED display flashes red for approx. 30 seconds. This is the phase in which the machine is heating up. When it's ready, the LED indicator will turn green. So: does this happen? If not I would think of a broken heater or thermosensor. I fear you have to open it, perhaps you can measure the resistance of the heater or the sensor. Another possibility is a broken pump. But as always: it's difficult to say without seeing the device.