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JGDUSC posted a topic in Heating, Ventilation, and Air Conditioning (HVAC)Serial EU206227148y Large window unit that doesn't get used a great deal. Cools the upstairs man cave when needed. Found it beeping after going after something I needed. Unit hadn't been run for a week or more. Control board COR128P has a little speaker on it beeping loudly. Unit wont do anything but beep. Nothing on display. Any thoughts on where to start or if I even should? Thanks!