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This can be caused by several things. So you have no fan or compressor coming on? Do you have a 12 VDC test light for some testing? And did you check the main fuse in your load center? This might be something simple. And did you check the service breaker to be sure it wasn't tripped? Flip it off and then back on again. Get back to me and I can help you sort this out. I will make a phone chat option for you as well as sometimes that is faster and easier to understand. No time limit. All follow ups are included in our fee.
Just checking back in to see if you were able to resolve this or do you still need more input from me here?