Why does my window air conditioner have ice on it?

This is usually caused by a dirty or clogged air filter and can often be remedied by a simple change or cleaning of the filter. Restricted or reduced airflow can cause the evaporator coil to drop below freezing temperature and begin to accumulate ice as the humidity from the surrounding air collects and freezes.Click to see full answer. In this manner, why is there ice build up in my window air conditioner?Fan Motor Capacitor. The most common cause of window air conditioners icing up is a lack of adequate air flow. If the circulating fan is not running or running too slow, little or no air flow over the evaporator coils will cause them to become too cold and frost or ice can form, restricting air flow even more.Subsequently, question is, how do you fix a frozen window air conditioner? Allow the unit to thaw naturally until water begins dripping freely before attempting to turn the fan on again. Turn the air conditioner to the fan-only setting if the fan isn’t frozen or after it has begun to thaw. The warm air circulating through the unit can help thaw the frozen coils. Also know, how do I keep my air conditioner from freezing up? To sum up, here’s what you need to do to prevent the A/C from freezing: Have the refrigerant level checked. Change the filter monthly. Keep the supply vents open. Have the fan speed increased. Have the thermostat checked out. Inspect the condensate drain weekly. Make sure any window units you have are angled correctly. What causes an air conditioner to ice up?There are many reasons why your AC unit may be freezing up. Air conditioners need proper airflow to keep the cold coil warm. A freeze up can also be caused by low refrigerant and improper fan operation. Low refrigerant levels make the coils too cold, and a faulty fan prevents air from moving.