Skills Hub
leak-detection-repair
Bubble Method Leak Detection
Use soap-and-water to find medium and large refrigerant leaks.
About this skill
Bubble method leak detection using a soap-and-water solution applied to pressurized fittings and joints. Best for medium and large leaks; very small leaks may not produce visible bubbles.
8 total steps
4 critical steps
Time limit: 10 min
What graders are watching for
- 1Best for medium and large leaks
- 2Observe each joint for 10 to 30 seconds
- 3Rinse the soap solution after testing (corrosive to aluminum)
Common mistakes (and how to avoid them)
- !Pressurizing with nitrogen (masks small leaks)
- !Not rinsing the soap solution (corrodes aluminum)
- !Missing the leak because you moved on too fast
Practice this skill step-by-step
The static walkthrough above is the marketing overview. The full step-by-step interactive practice (with critical-step highlighting, per-step "why this matters" rationale, and what graders watch for on each individual step) is unlocked with a subscription.