Commercial Refrigeration / RAC Technician
Diagnose walk-ins, ice machines, reach-ins and commercial refrigeration systems the way the work is actually done — forced decisions, coaching on wrong turns, and a confirmed root cause before you finish. Held to the same lab standard as the Solar Technical Training track.
High-value diagnostic training we stand behind — work the graded labs, then book the credential that applies where you work: EPA 608, NATE, Red Seal, ARCtick, F-Gas, CDACC, SAQCC Gas or ESSCI.
- Interactive decision labs
- Built by working technicians
- Path-based verifiable certificate
- Know which exam to book
- Worldwide online
Free exam practice for this path
Refrigerant handling is examined separately from diagnostics. Work the free EPA 608 practice questions and the certification prep hub alongside these modules — exam preparation only, no official credential is issued here.
New to commercial refrigeration?
Two guides sit alongside this path: an overview of refrigeration technician training and the diagnostic labs inside it, and an honest explanation of what commercial refrigeration certification means versus the EcoPowerHub path certificate.
Who this is for
- Technicians moving from residential HVAC or appliance repair into commercial refrigeration
- Service technicians who already handle walk-ins or ice machines and want systematic diagnostic judgment
- Shop owners and supervisors who need a consistent training standard for commercial refrigeration calls
- Career-changers who want the higher-skill, higher-value RAC niche
What you will be able to do
- Systematically diagnose a walk-in that is not holding temperature
- Isolate why an ice machine is not making ice
- Apply superheat and subcooling to real sealed-system decisions
- Recognise defrost faults and confirm the cause
- Document the diagnosis and verification steps cleanly
Modules — lessons first, then the lab
- 1.1Superheat and subcooling on a TXV walk-in Paths A–D
- 1.2Restriction vs overcharge vs low air: three different next tests Paths A–D
Lessons run in the learner portal. Enrolled learners open them from the HVAC dashboard; enrolment unlocks the lessons, the labs, the exam banks and the timed mocks.
- 2.1Box vs refrigeration: prove the box before the compressor Paths A–D
- 2.2Isolation and recovery discipline on a charged walk-in Paths A–D
- 2.3The not-holding-temp playbook, in order Paths A–D
Lessons run in the learner portal. Enrolled learners open them from the HVAC dashboard; enrolment unlocks the lessons, the labs, the exam banks and the timed mocks.
- 3.1Harvest vs freeze: which half of the cycle failed Paths A–D
- 3.2Water, condenser, bin switch — before a new board Paths A–D
- 3.3The no-ice playbook: complaint to confirmed cause Paths A–D
Lessons run in the learner portal. Enrolled learners open them from the HVAC dashboard; enrolment unlocks the lessons, the labs, the exam banks and the timed mocks.
- 4.1Warm reach-in: door, load, and evaporator ice before the compressor Paths A–D
- 4.2Dirty coil / low air vs restriction vs charge on a warm reach-in Paths A–D
- 4.3The warm reach-in playbook: picking the next test in order Paths A–D
Lessons run in the learner portal. Enrolled learners open them from the HVAC dashboard; enrolment unlocks the lessons, the labs, the exam banks and the timed mocks.
- 5.1Electric vs hot-gas defrost: what “won't defrost” is not Paths A–D
Lessons run in the learner portal. Enrolled learners open them from the HVAC dashboard; enrolment unlocks the lessons, the labs, the exam banks and the timed mocks.
- 6TXV hunting and temperature swingsLiveTXV hunting lab
- 7Condensers and high head pressureLiveCondenser / high-head lab
- 8Refrigerant hazards (A2L / R-290 / CO₂)LiveA2L safe-handling lab (related practice)Lab · Paths A–D
Recommended alongside — not on this certificate.
- 8.1A2L on commercial equipment: same rules, bigger charge Paths A–D
- 8.2Hydrocarbon cabinets: tiny charge, real fuel, never top off Paths A–D
- 8.3CO2 (R-744): high pressure, silent asphyxiant, not 404A Paths A–D
Lessons run in the learner portal. Enrolled learners open them from the HVAC dashboard; enrolment unlocks the lessons, the labs, the exam banks and the timed mocks.
- 9Rack systems — one circuit downLiveRack — one circuit down lab
Recommended alongside — not on this certificate.
NATE Commercial Refrigeration practice (optional)
Preparing for the NATE Commercial Refrigeration ICE? There is an optional Service & Repair-heavy practice bank and a timed exam-style mock built around walk-ins, ice machines, reach-ins, defrost and TXV decisions. Not required for the Path B certificate — the certificate stays lab-and-lesson graded. Practice only: we do not issue NATE; sit the real exam with NATE.
Certificate
Commercial Refrigeration Field Diagnostics — Core (Academy)
On completion of the required modules and labs you receive a path-based, permanently verifiable EcoPowerHub Academy certificate. Scope: walk-ins, ice machines, reach-ins and prep tables, defrost systems, superheat / subcooling decisions, condenser and high-head faults, and single-circuit diagnosis on supermarket racks (one case group down). Rack-pack and parallel-compressor diagnosis, CO₂ / transcritical and NH₃ plant work are NOT covered by this certificate. This is a diagnostic-competency certificate. It is a supplement to, not a replacement for, any official refrigerant-handling or trade credential required in your region.
Path-based, permanently verifiable diagnostic-competency certificate — our record of the graded work you did here, alongside the official credential you book in your region.
Certificate eligibility
Commercial Refrigeration Field Diagnostics — Core (Academy)
What it is: proof you diagnosed commercial refrigeration faults — walk-ins, ice machines, reach-ins, defrost, superheat / subcooling, condenser and high-head faults, and a single circuit down on a supermarket rack — to a confirmed root cause and verified the fix, graded server-side inside EcoPowerHub Academy.
What it is not: This certificate confirms demonstrated diagnostic competency inside EcoPowerHub Academy on walk-ins, ice machines, reach-ins, defrost, superheat / subcooling, condenser and high-head faults, and single-circuit diagnosis on supermarket racks. It does not cover rack-pack / parallel-compressor diagnosis or CO₂ / transcritical and NH₃ plant work, it is not a CO₂ rack qualification, it is not a statutory or refrigerant-handling credential, and it does not replace EPA 608, SAQCC, EPRA, ESSCI or any other credential required in your region. We do not issue EPA 608, NATE, RETA, or a contractor licence.
Required labs
- Walk-in not holding temperatureSign in to recordPlay lab
- Ice machine not making iceSign in to recordPlay lab
- Walk-in freezer defrost faultSign in to recordPlay lab
- Superheat / subcooling decisionSign in to recordPlay lab
- Reach-in / prep table warmSign in to recordPlay lab
- TXV huntingSign in to recordPlay lab
- Condenser / high headSign in to recordPlay lab
- Rack — one circuit downSign in to recordPlay lab
Required module completion
- Walk-in methodSign in to track
- Box vs refrigeration: prove the box before the compressorIn the portal
- Isolation and recovery discipline on a charged walk-inIn the portal
- The not-holding-temp playbook, in orderIn the portal
- Ice machinesSign in to track
- Harvest vs freeze: which half of the cycle failedIn the portal
- Water, condenser, bin switch — before a new boardIn the portal
- The no-ice playbook: complaint to confirmed causeIn the portal
- Defrost + TXV superheat / subcoolingSign in to track
- Electric vs hot-gas defrost: what “won't defrost” is notIn the portal
- Superheat and subcooling on a TXV walk-inIn the portal
- Restriction vs overcharge vs low air: three different next testsIn the portal
- Reach-in / displaySign in to track
- Warm reach-in: door, load, and evaporator ice before the compressorIn the portal
- Dirty coil / low air vs restriction vs charge on a warm reach-inIn the portal
- The warm reach-in playbook: picking the next test in orderIn the portal
A lab is passed when the root cause is confirmed, the repair or decision is verified, and no safety violation was recorded. Recommended alongside, not required: the natural refrigerant safe-handling decision lab (CO₂ / hydrocarbons).
Regional exam-prep notes
- United States
- Book EPA Section 608 (Type II / Universal) at an EPA-approved proctor — NATE, ESCO or HVAC Excellence — then NATE for the specialty.
- South Africa
- Book the SAQCC Gas safe-handling authorisation for in-scope gas work; SAQCC Gas issues it.
- Kenya / East Africa
- Book the NITA / EPRA-adjacent assessment that matches your scope of work with the relevant body.
- India
- Book the ESSCI RAC Service Technician (NSQF) assessment; ESSCI and the Ozone Cell run the official credentials.
Always verify current requirements with the authority in your jurisdiction.
Questions technicians ask
- Do you issue the official EPA 608 or equivalent credential?
- No. We provide exam preparation and certify diagnostic competency demonstrated in our labs.
- Is a Path B lab free to try?
- Yes — Walk-in Not Holding Temp is public and playable without an account, designed to show the standard used in the full path. The other Path B labs are part of HVAC Technical Training — Paths A–D and run after enrolment.
- How long does the path take?
- Most learners complete the core modules and labs part-time over several weeks. It is self-paced.
- Is this only for experienced technicians?
- No. The path assumes basic electrical and refrigeration-cycle knowledge (available in the shared foundation) and then builds commercial refrigeration judgment.