A technician explains why you should inspect equipment visually before using meters. Look for loose wires, burned terminals, corrosion, oil stains, tripped breakers, ice, and leaks. Follow the power path from source to load, then measure to confirm what you already spotted.
Hey, are you new to the trades? Here's something you may not know about using your eyes on a service call. Before you reach for a meter, stop and look. Your eyes are a tool. A deliberate visual inspection can solve a problem faster than a page of readings. Look for a loose wire at a terminal, the connection point where a wire attaches. Check for burned terminals, melted insulation, corrosion, watermarks, Oil stains and rubbed-through wires. Look at filters, belts, drain lines, panels, and disconnects. Is the filter packed with dirt? Is a service switch off? Is a breaker tripped? Is there ice, a leak, or obvious physical damage? These clues tell you where to test next. A meter cannot always show a wire that is loose only when the blower vibrates. It cannot tell you that a filter is filthy, a panel is blocking a safety switch, Or a drain line is overflowing. Do not confuse looking around with guessing. Be intentional. Follow the equipment from the power source to the load and notice what is out of place. Start with the obvious. Then measure to prove what you found. You will work faster, safer, and with fewer missed details. Now that you know, you can help someone else know.
