Air Conditioning Repair Certification (ETI) Practice Exam

Using a leak detection dye or electronic leak detector is a highly effective method for detecting refrigerant leaks. This approach utilizes specialized tools that are designed to identify even minute amounts of refrigerant escaping from the system.

A leak detection dye is introduced into the refrigerant system; as the refrigerant escapes, the dye leaks out with it and can be spotted visually, often under UV light, making it easy to locate the source of the leak. An electronic leak detector, on the other hand, detects changes in the concentration of refrigerant in the air surrounding the unit, alerting the technician to potential leaks.

These methods are precise and can significantly reduce the guesswork involved in locating leaks compared to other less reliable techniques. Observing for physical damage might suggest a leak, but it does not provide direct evidence. Similarly, listening for strange noises could indicate operational issues but does not confirm a refrigerant leak. Checking the temperature of the air output can assess system function but is unrelated to detecting leaks. Therefore, the use of leak detection dye or an electronic leak detector stands out as the most reliable and accurate method.