How do I check my mini split for leaks?

Checking a ductless mini-split system for refrigerant leaks involves a systematic inspection of all pressurized copper line sets and mechanical connections. First, perform a thorough visual check of the indoor flare nuts and outdoor service valves, looking for greasy or oily residue, because escaping refrigerant carries compressor oil and leaves a sticky film. Second, use an electronic refrigerant leak detector wand to sniff around all joints. Third, technicians can apply soapy water bubbles to fittings or pressurize the closed loop with dry nitrogen to monitor pressure drops. You can troubleshoot performance drop-offs easily. You can verify that the exact leak location is found when electronic sensors or bubble tests reveal the precise rupture point requiring professional brazing or mechanical flare tightening.