Air-conditioning & refrigeration technician
An 8-step path to becoming an AC and refrigeration technician: electrical and refrigerant safety, the refrigeration cycle, installing split units, vacuuming and charging R32/R410A, cleaning and servicing, and diagnosing inverter boards and fridges. Suits hands-on people comfortable with heat and working at height.
Start here
Step 1: Electrical, refrigerant & working-at-height safety
One short lesson per step, 10–15 minutes on a phone. No sign-up needed.
Hands-on roadmap
Roadmap
- Step 1Lesson
Electrical, refrigerant & working-at-height safety
Isolate power and verify with a tester, wear gloves and goggles when venting gas, use a harness when hanging outdoor units; R32 flammability and ventilation.
No English content for this step yet.
- Step 2Lesson
The refrigeration cycle & reading gauges
Compressor, condenser, expansion device, evaporator; reading manifold gauges, pressure–temperature for R22, R410A, R32; signs of undercharge, overcharge and moisture blockage.
Requires: Electrical, refrigerant & working-at-height safety
No English content for this step yet.
- Step 3Skill
Installing a wall-mounted split AC properly
Choose locations, mount the outdoor bracket, core the wall, flare copper pipe and torque it with a torque wrench, slope the condensate drain, wire power and signal cables.
Requires: The refrigeration cycle & reading gauges
No English content for this step yet.
- Step 4Skill
Vacuuming, leak testing & charging refrigerant
Use a vacuum pump and micron gauge, pressure-test with nitrogen, charge by weight or by current and pressure; common mistake: skipping evacuation and ruining inverter compressors.
Requires: Installing a wall-mounted split AC properly
No English content for this step yet.
- Step 5Skill
Cleaning & servicing ACs and fridges
Wash indoor and outdoor coils with a pressure washer and catch bag, clean the blower wheel, test capacitors, measure current; clean fridge coils and unblock drain holes.
Requires: Installing a wall-mounted split AC properly
- Step 6Skill
Error codes & inverter AC board diagnosis
Look up Daikin, Panasonic, LG and Casper codes; test thermistors, DC fans, IPM modules and filter capacitors with a multimeter; tell board faults from compressor faults.
Requires: Vacuuming, leak testing & charging refrigerant, Cleaning & servicing ACs and fridges
- Step 7Project
Full install and service job for an apartment
Install two AC units in a sample apartment, vacuum, record pressures and running current, service an old unit; take before and after photos and write a handover sheet.
Requires: Error codes & inverter AC board diagnosis
No English content for this step yet.
- Step 8Certificate
Trade certificate, pricing & finding customers
Prepare for an elementary vocational certificate or national skills test in refrigeration; build transparent prices for install, cleaning and gas, warranties, and get jobs via dealers and apps.
Requires: Full install and service job for an apartment
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