How to Tell If a Window Air Conditioning Unit Is Frozen

Window air conditioners, unlike the larger central air units, cool a home by circulating air through one room. But just like those larger systems, window air conditioners can freeze up if not properly maintained. There can be many causes for freezing and identifying a frozen window air conditioner is not difficult. You just have to know what signs to look for.

Things You'll Need

• Wrench or large screwdriver

Instructions

1. Turn the window air conditioner on and wait one minute, listening closely. If the unit does not respond or sounds as if it is struggling, or is coming on and going off repeatedly, then it may be frozen and you must go outside to inspect it.

2. Inspect the unit thoroughly. You should be able to feel air being drawn into the machine. If you cannot feel any movement of air and cannot hear any machine parts moving, the unit is most likely frozen.

3. Use the screwdriver or wrench to remove the front grill of the air conditioner. Examine the front grill and the air filter. If the front grill is dirty and covered with dead insects or the air filter is caked with dirt, these may be causing the unit to freeze up. Also, look for any signs of animal activity, such as nests or droppings.

4. Check the coils of the machine. If the evaporator coil has any deposits of ice around it, the unit is definitely frozen.

Tips & Warnings

• If any insects or animals are nesting in your air conditioner, you best bet is to make two calls, one to a pest control company and one to an HVAC (heating, ventilating and air conditioning) repairperson.

• Insects like wasps and hornets sometimes take residence in broken air conditioners, so be very careful when inspecting them.

References

• Warmair.com
• Air-Conditioning-and-Refrigeration-Guide.com