Sentinel HD55 stopped running and display "froze" and no buttons would work.

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Brand new Sentinel HD55 running for approximately 3 days reduced humidity in basement from 58% to 43% before stopping overnight with 43% on display with humidity level set to 36%. No buttons would work when pressed including the power on/off. I unplugged the unit, waited 30 seconds, and plugged it back in. Seems to be operating properly again but I would like to know what happened and if I have an issue that needs to be addressed.

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I'm here for the exact same thing. For weeks it's been stuck at 52. WOW I thought! It took all the humidity out and doesn't need to run. Well my humidity gauge is reading 59%. So I climbed up there and it was stuck as you described. No buttons would work. I turned it off and waited. Now it's running trying to dehumidify from 72%. It's not even a month old. 
 

So the solution is really mail it back and get another one? Can't just change the motherboard? 

Hi Dennis,

Judging by the description of the problem with the motherboard, it's recommended to replace it with a new machine.

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