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What is the make and model of the A/C and the controls?
Dometic. Is that the A/C or the control or both? A photo of the thermostat would help. Use the paperclip icon to attach it to your post.
The thermostat just controls the control board. That controls the relay. If the control board isn't allowing the relay on the compressor to turn off, then it will hum OR there is an issue with the compressor itself. Testing is needed here to find out which it is. Some of these are hard to find parts for any more.
Just checking back in to see if perhaps you might have missed by earlier responses to your question? Easy to do considering the volume of e-mail most of us get every day! If you need me to resend that information please let know. Thanks!