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I will need the model number of your unit to look this up for you.
Ok the most common reason for the display to stop working is corroded connections. What you will need to do is acccess the control boards and check that the terminals are clean and not corroded or loose. Please click here to download a copy of the tech sheet for your unit. The diagnostic information is in it.
Please click here to order the parts you may need to repair the unit.
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Not a problem, and you are welcome. =)