The first thing you want to do is TURN OFF your air conditioner. Do this by going to your breaker and turning off the appropriate switch. Another way is to turn the thermostat to fan only. By doing this will allow the ice from your air conditioner to thaw out. Now what's causing your air conditioner to freeze is most commonly a dirty air filter and/or evaporator coils. When dirty air is being prevented from flowing into the unit.