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Vendo 721 live display button issue

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I have an older style vendo 721 live display but the buttons don’t work like when trying to program it. They all light up when you first close the door. Any ideas on how to fix this?thanks in advance 

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If it doesn’t respond to the selection switches, the only options are unplugged/open(cut) harness or a faulty board. Start at the board and make sure everything is securely installed and then work your way up the selection harness looking for cuts,  bite marks, broken/unplugged switches, etc.  

if you hit the mode switch, it may give you an error to lead you in the right direction. 

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