Turn it off.
Your outside AC unit may be making a humming noise due to a faulty capacitor, a malfunctioning fan motor, or debris blocking the unit. It is important to have a professional HVAC technician inspect and repair the unit to prevent further damage.
In the central ac system it could be a few diffrent things that are not working, that is causing the fan not to blow. Their could be no power to the outside unit, a bad contactor, a bad capacitor, or your high pressure switch could be shut down.
look outside where the drain for the ac is and run a coat janger in there to clean it out.
Yes
Sounds as if you capacitor is going bad or perhaps the contact is not pulling in i would check voltage on both sides of the contactor to verify this
The outdoor portion of the central ac unit is what gives up the heat from indoors, so it has to be outside. For a more thorough explanation see the question: How does air conditioning work.
The condenssor is outside of the house, the blower unit is somewhere in the house,and call the whole system, "central air".
The expansion device inside the outside unit expands the refrigerant gas and as a result, the discharge lines chills
A humming noise in a car's AC system can be caused by several factors, including a failing blower motor, worn-out bearings, or debris obstructing the fan. Additionally, issues with the AC compressor, such as low refrigerant levels or mechanical failure, can also generate humming sounds. It's important to diagnose the source of the noise promptly to prevent further damage to the AC system. Regular maintenance can help mitigate these issues.
how do you check freon on central ac and what should the guages read.
can a faluty thermostat affect your central ac working?
Central AC primarily uses electricity for operation.