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Simulated workplace
Scenario · Refrigeration and Air Conditioning

Diagnose and repair a cold room that is not holding temperature

You are a Refrigeration Technician holding a refrigerant handling licence.

Intermediate3 to 4 hours8 tasks
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Home/Scenarios/Diagnose and repair a cold room that is not holding temperature
The situation

What has happened

Merriwa Cold Storage's cold room 3 alarmed overnight at minus 12 degrees against a set point of minus 20 and frozen product is at risk. Job J-26-1184 is open and van V-05 with recovery unit RU-02 and scale SCL-01 is on site. Leak detector LD-03 is away for its reference check so LD-01 from the workshop is in the van. The system is an R404A condensing unit on the roof with an evaporator in the room. The site manager reports the condenser fans sounded loud last week and that the unit has been short cycling. The refrigerant handling log shows a flare joint on cold room 2 was repaired two weeks ago, but cold room 3 has no recent history.

Your brief. Diagnose the fault logically across the electrical control circuit and the refrigeration circuit, isolate safely before any electrical work, recover and recharge refrigerant only if the system must be opened, leak test and commission the repair, and record everything on the job, the refrigerant handling log and the commissioning sheet so that the customer and the business have a complete record.
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Tasks

Deliverables

  • Completed job safety analysis with isolation record
  • Fault diagnosis notes with readings and reasoning
  • Refrigerant handling log entry with recovered and charged masses and leak test result
  • Test results and commissioning sheet with final operating readings
  • Updated job record with repair details and customer briefing

Documents to use

Systems to use

Job and Work Order Board

The record of every quoted, scheduled, in-progress and completed job across all departments, with the site, allocated tradespeople, supervising electrician and status.

Refrigerant Handling Log

The licensed technician's record of every refrigerant recovery, charge, leak test and cylinder movement, reconciled monthly against cylinder stock.

Instrument, Plant and Vehicle Register

Tracks every test instrument, refrigerant recovery unit, scale, leak detector, ladder, elevated work platform and service van with its calibration or inspection status.

Test and Compliance Register

Records the mandatory test results, certificates of electrical safety, solar compliance documents and observations for every job before it is handed over.

For trainers and assessors

Units of competency

Current on training.gov.au for the Electrotechnology Training Package as at 10 September 2026.

UEERA0031Diagnose and rectify faults in air conditioning and refrigeration control systems
UEERA0079Safely handle refrigerants and lubricants
UEERA0053Install, commission, service and maintain medium temperature systems
UEERA0044Find and rectify faults in single phase motors and associated controls
UEERA0038Establish the thermodynamic parameters of refrigeration and air conditioning systems

Qualifications

UEE32225Certificate III in Air Conditioning and Refrigeration
Assessor notes

What to look for

Evidence guide

Look for a diagnosis that uses readings and evidence rather than guesswork, safe isolation before any electrical work, and refrigerant handled without venting with masses recorded consistently in the log. The commissioning sheet must show the system returning to correct operating conditions. Check that the instruments used are in the register and in service and that the customer briefing is accurate.

The student's evidence summary lists every record they created or changed in the systems named above, their notes and the tasks they ticked. Verify it against the deliverables and your own assessment tool.