Window Air Conditioner: Compressor humming but not working
If you turn the air conditioner off and then back on too quickly, the pressure of the refrigerant gas rises too high; as a result, the compressor hums and won't start until the refrigerant pressure equalizes between the evaporator and condenser coils. Once you turn the air conditioner off, leave it off for several minutes before restarting it. Other reasons the compressor is humming but not starting include a dirty or otherwise restricted condenser coil or the short cycling of the compressor.
Replace the window air conditioner compressor
The compressor is a pump that compresses the refrigerant-Freon-that's sealed in the window air conditioner. If the compressor doesn't run when activated, have a refrigerator service technician replace it; by law, an EPA-licensed technician must do this repair because it involves Freon.
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