Why Is My Outside AC Unit Frozen? A Tech from Southern California Explains
If your outside AC unit is frozen, that's not normal. Here’s a very simplified explanation for what’s happening. Your AC is freezing up because something in the system is causing your refrigerant temperatures to drop too low. This can cause the evaporator coil (part of the inside unit) and/or the condenser coil (part of the outside unit) to freeze. This often leads to your air conditioner icing up.