No power to the top drawer needs to be verified.
Are you saying the lights are blank and when you press the start buttion nothing happens?
One reason the controller can shut the power is that the heater overload protection thermal resistor has opened. Unfortunately the only way to fix this is to replace the entire heater plate at the bottom of the drawer.
To confirm if the controller is operational or not, press Keylock and Start/ Pause button together for 5 sec (press Keylock first) and see if the Lights light up. If nothing happens then either the power has shutoff as mentioned above or controller is faulty.
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