Hi guys- I have an API 121 snack vending machine. Typically, when I shut the door on the machine I get a banner that says "have a nice day" and the machine will accept your money and let you choose an item. The have a nice day banner is now blinking and resetting and blinking again. The machine will accept a dollar bill but it immediately returns the dollar in the form of change and will not let you choose an item. I have unplugged the machine and also unplugged the coin mechanism. What do you think the problem is? Thanks for your help in advance.
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