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January 7, 2026
HVAC Multimeter Skills: Continuity vs Resistance & Diode Testing
Master the critical difference between Continuity vs Resistance testing! This essential HVAC Multimeter Skills training covers proper techniques for diagnosing compressors, motors, and inverter boards, plus essential Diode Testing fundamentals.
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First, let's state the obvious and clear the air a bit. The photo above is SUPER CHEESY! But this story is about three bad techs who don't know it, so a photo of three models clearly posing in clean clothes makes as good a proxy for a bad tech as anything else. First off, I'm not […]
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Service valves are so basic, and we see them with such regularity that we can miss them altogether. Before I give the tips, I want to address the tech who tells the customer it was “probably the service valve” or “the caps were loose” as a plausible reason for a leak without actually making a […]
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When you walk up to a piece of equipment, you want to follow a process to ensure that you accomplish five things: #1 – You diagnose the fault correctly. #2 – If possible, you find the “why” of the failure. #3 – Find any other problems or potential problems with the system that can cause […]
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