If you find your air conditioner frozen in a block of ice, it’s best to immediately turn the system off and let it completely thaw before any additional damage occurs. There can be several reasons as to why this happens.
First, check that the system is collecting warm air from the house by confirming that return vents are clear and the air filter in the system is not clogged. Bigger issues include low refrigerant or an issue with the systems fan. Regardless, this is a clear indication of a problem and should be diagnosed by a professional right away.