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Lets see what we can do to solve this problem,Be right with you.
Ok I assume the compressor in outdoor unit IS going off , just the fan continues to run.Please let me know if compressor is staying on too as that will take us in a completely different direction on troubleshooting. Let's start by checking wiring to fan in outdoor unit.
Verify the following:
Black to NC on defrost board
Violet to C on capacitor
Brown to F on capacitor.
We will go from here