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The contactor on the outside unit is bad and the contacts are stuck closed on the contactor, you need to check and change that out. You are looking for this.
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First step in troubleshooting is going to be to determine if fan is controlled by defrost board or gets power directly from contactor.If the unit is a heat pump.most often fan is powered through defrost board.If issue is contactor, both compressor and fan should be running.Please verify and provide a model on unit so we can pull a manual and guide you in troubleshooting before you just start changing parts.