Help! My heat pump will not turn off. Do I leave it alone and let it be or do I?

turn off the unit from the inside thermostat and turn the fan to off? It has white frost on the lines out side. I did have 4 pounds of refrigerant put in four months ago. It's very hot where I live. Thanks!
Update: No matter what I do the fan outside keeps spinning. I turned off the breaker for 10 seconds and when I turned it back on, the spinning continues.
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