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My name is Billy.
I have the Gree flowchart for testing this. Is there only one indoor head and one outdoor or do you have multiple indoor units?
No problem..here is a step by step chart to confirm..I will send page 2 next
you do not want the flowchart?
it could be a simple reset, bad wire all the way to an indoor or outdoor board but the chart helps you confirm..
Its free for the chart so here is page 2 for final trouble shoot.
Have a nice evening