There can be hundreds of reasons why your air conditioning system requires repairing but there are a few reasons that are common such as:
1. Ice on Condenser
It is commonly observed that ice is a set on lines at u/s due to defective blower motor capacitor, extremely dirty filter or low on refrigerant.
2. Defective Thermostat
If the thermostat of AC is defective, it means it would not hold proper temperature also it would not be calibrated.
3. Water Leakage
Another common problem in air conditioning system is water leakage. It usually occurs when drainage stops or evaporator coil pan rust out.
4. Improper Functioning of Outside Fan
In this problem air conditioning compressor overheats and transfers heat from room to outside in an improper way. In worse cases, it completely damages the compressor.
It is important that you should know all these common problems with A/C in order to consultant any AC repairing professional at the right time.