I have the above appliance. When I turn the hot water tap on the leds on the display unit light up 30 degrees, 40 degrees, 50 degress and then the boiler cuts out and the led below 80 degrees starts flashing. As soon as this happens the boiler cuts out and i lose hot water. The boiiler then seems to reset itself after about 10 minutes and the same thing happens. Any ideas what it could be? Temeprature Sensor?