When you air conditioner suddenly cannot function properly, the first thing you can do is a minor checking to know whether any trivial error happens to the air conditioner aircon service. If you are sure everything is connected, lit, installed properly, and clean, it might be time to contact your aircon service provider as such an expert will know better what to do to know the cause why the air conditioner cannot function properly.
If the condenser for the outdoor unit or air handler or furnace for the indoor unit does not work, you need to make sure the power jack is mounted. Children, pets, or yourself by such as an accidentally nudging the electric outlet when cleaning, can create electrical plugs become loose or even off.
The next is to check circuit breakers and fuses. Make sure both of these installed properly, powered on, and functioning properly. Circuit, especially in an older home, it is usually easy to overload if AC share a circuit with other equipment such as television, refrigerator, or microwave. Then, check also the thermostat to make sure it is set to cool the desired position, and it works fine. Similarly, the power jack, the settings of these tools can sometimes be changed inadvertently.