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With a volt meter check and see if you have 240 volts to the terminal block where the cord connects to the unit. If you do and nothing is lighting up on the display, but the light works you have a bad interface board. You can try and unplug the interface ribbon cable from the main CCU board and plug it back in and see if it comes on if not here is a link to the part.
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I was just touching base with you because I have not heard back from you and the question is still open and unrated, if there is something else I can help you with follow up questions are free and can still be handled even after you rate the service thanks.