An air conditioning system comes with three different contactors. Each of them has a specific role in the functionality of your unit. Contactors are used when the unit requires an electrical connection, whether it comes to heating or cooling. Otherwise, they stop. Once the connection is established, motors and compressors start working according to your instructions. However, there are situations when contactors might stop working due to the pitting formed on them. This is when you need to look for HVAC repairs. Such problems are not too severe or expensive anyway, so there is nothing to worry about. Get a few quotes upfront too.