Air conditioning is a rather complex and loaded system.
In the absence of proper attention to it, the air conditioner can let you down and stop working at the most inopportune moment. It is possible to avoid such problems if diagnostics and prevention are carried out at least once a year.
For the winter, the air conditioner should be disconnected from the power supply and mothballed to avoid unpleasant surprises in the spring and summer when needed.
Diagnostics can timely identify possible malfunctions and problems in the air conditioner's operation.
Freon leakage, poor electrical contact, oil oxidation in the lubrication system, etc.