I visited a home where the AC was running constantly but not cooling effectively, and the owner noticed ice on the copper lines. This pointed to a low refrigerant charge. The problem was a slow leak that I pinpointed at a faulty service valve core using my electronic leak detector. I solved the issue by replacing the valve core, performing a vacuum to remove any moisture, and then recharging the system with the correct amount of refrigerant. This stopped the leak and restored the system's powerful cooling ability.
I responded to a call where the homeowner's AC was humming but the fan on the outside unit wasn't spinning, a common problem in this July heat. I immediately suspected the capacitor. My multimeter confirmed it had failed and wasn't providing the necessary power to start the motors. I solved the problem by replacing the old, weak capacitor with a new, high-quality one. The system fired up right away, and the house was cooling down before I left.