There are many great diagnostic tools available to the service technician today, but I haven't found a tool as versatile as the simple isolation diagnosis. There are many ways this concept can be applied, but let's start with some examples so that you get what I mean. Low Voltage Short Circuit Isolation Diagnosis You arrive […]

We all know what excuses are. They tend to sound like, “I would’ve done a better job if I’d just had the right tools!” or “I would have found that disconnected duct if I weren't dispatched at 6 PM!” Some people probably say, “Those aren’t excuses. Those are reasons!” OK, sure, we can call them […]

Testo 760 Category IV Multimeter I was standing at a booth at the HVAC Excellence Educators conference, and an instructor walks up, grabs a meter, and asks me, “What's the difference between a category 3 and a category 4 meter?” Well, I really wasn't sure, but I knew that the category 4 meter is rated […]