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You need to provide more information on the problem. If you have no air flow inside, it could be the indoor fan is not running. This could produce a hissing sound as the refrigerant is boiling inside the copper but not removing any heat and is causing high head pressure in the compressor which will shut down the outdoor unit via the pressure switch. The fix could be as simple as replacing the evap fan motor.

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โˆ™ 2006-05-02 14:41:20
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Q: What's the problem if your AC fan outside keeps shutting off and starts a hissing sound and no air is coming through the vents?
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