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Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond as typing, researching and adding links takes me time to do so please be patient and often I will ask you questions to narrow down the issue to get is diagnosed correctly.
Can you take a picture of the switch that is buzzing and upload it here?
AHHHHH yes the contactor is fried, I can see the burned up contact on the contactor. You need to replace that to get the unit working again. Here is a link to one.
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That should be it for sure, these contactors just do not last like they used to:(