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313A · Red Seal Refrigeration and Air Conditioning Mechanic

Find the gap before the exam does.

Refrigeration circuit A vapour-compression circuit. The compressor sends hot high-pressure gas to the condenser; liquid runs through the liquid line to the thermostatic expansion valve; low-pressure refrigerant boils in the evaporator and returns through the suction line. Subcooling is marked on the liquid line and superheat on the suction line at the valve's sensing bulb. Subcooling6 K Superheat8 K 02 · Condenser 01 · Compressor 03 · TXV 04 · Evaporator Highside Low side

Independent practice for the 313A certificate of qualification exam. A diagnostic weighted like the Red Seal breakdown shows where you would lose marks, every answer is explained with its sources, and troubleshooting scenarios make you talk through the fix.

Try 5 questions →How the exam is weighted
Exam questions
125
Work areas
6
Free, no account
5 Qs

01 The breakdown

The exam, weighed out in six parts.

The Red Seal publishes how the Refrigeration and Air Conditioning Mechanic exam splits its 125 questions. Every diagnostic here draws questions in those proportions, and every report uses the same six areas, named in plain language.

MWA A8%

Safety and trade practice

Performs common occupational skills

  • A-1Maintains safe and healthy workplace81%
  • A-2Maintains continuous learning13%
  • A-3Uses communication and mentoring techniques6%
MWA B16%

Tools, piping and refrigerant handling

Performs routine trade activities

  • B-4Uses tools and equipment24%
  • B-5Organizes work21%
  • B-6Performs work site preparation19%
  • B-7Performs trade-specific activities36%
MWA C13%

Planning installs and retrofits

Plans installation

  • C-8Plans installation of standard and high efficiency HVAC/R systems34%
  • C-9Plans installation of control systems28%
  • C-10Plans retrofits38%
MWA D21%

Installing systems and controls

Performs installation

  • D-11Installs HVAC/R systems63%
  • D-12Installs control systems37%
MWA E17%

Commissioning and start-up

Performs commissioning

  • E-13Commissions new and retrofitted HVAC/R and control system components54%
  • E-14Verifies system performance46%
MWA F25%

Maintenance, service and troubleshooting

Performs maintenance and service

  • F-15Maintains HVAC/R systems30%
  • F-16Services HVAC/R systems43%
  • F-17Maintains and services control systems27%

Source: Red Seal examination weightings and task matrix, read 2026-09-21. Codes and weights are official; the plain-language names are ours.

02 The report

One score per area. One next step.

No overall percentage pretending to be a verdict. You see correct out of answered for each work area, which areas have too few questions to judge, and a single next step chosen by a published rule.

01

Diagnose

30 questions drawn by exam weight. Leave halfway, resume on any device.

02

Read

Every option explained, with the source and the task code it belongs to.

03

Practise

Drill one area with instant feedback, or a timed mixed set for pace.

04

Clear

Misses come back in a review queue until you get them right.

Diagnostic reportExample
Answered
30 of 30
Correct
21 of 30
Content version
2026.09-draft
F Maintenance, service and troubleshooting5 / 8
D Installing systems and controls5 / 6
E Commissioning and start-up2 / 5
B Tools, piping and refrigerant handling4 / 5
C Planning installs and retrofits3 / 4
A Safety and trade practice2 / 2 · too few

Next upCommissioning and start-up: 3 missed of 5, and 17% of the exam.

Illustrative answers. Correct out of answered, never a pass prediction.

03 Voice troubleshooting lab

Say what you would check. In order.

Each scenario gives you the call, the readings and a question. Answer out loud for up to 90 seconds, or type. Your answer is checked point by point against a checklist written by a person: what you covered, what you missed, what was unclear.

The model only maps your words to that checklist, and it has to quote you. Our server computes the score, and anything it is unsure of earns no credit. Recordings are transcribed and discarded.

Try a scenario →
Scenario · outdoor unit silentExample

“First I'd check the breaker and the disconnect, make sure there's line voltage at the unit. Then I'd check for 24 volts at the contactor coil. If I've got 24 and it hasn't pulled in, it's the contactor.”

  • CoveredChecks line voltage supply to the outdoor unit
  • CoveredChecks for 24 V at the contactor coil
  • UnclearInterprets the coil voltage result correctly
  • MissedChecks safeties in the control circuit
  • MissedWorks safely around line voltage
Covered weight 5 of 10 · illustrative

04 What we will not do

Exam prep you can check.

If a practice product cannot tell you where its questions came from, you cannot tell whether its explanations are right. So these are the rules.

✗ NeverRecalled or “actual exam” questionsEvery item is original, written against the public task list.
✗ NeverPass predictionsYou get correct out of answered, per area. Nobody can honestly give you odds.
✗ NeverAI-written questions for salePeople write them; a certified 313A mechanic reviews them before anything is sold.
✗ NeverStreaks, points, leaderboardsShift work does not run on a daily schedule. The review queue waits for you.

05 Field notes

The concepts behind the questions.

Plain explanations of the readings and rules the exam keeps returning to, with sources, plus a glossary of 54 HVAC/R terms.

01 · Area E + F

Superheat vs subcooling: what each reading tells you

Superheat reads the evaporator, subcooling reads the condenser. How to calculate both, which one to charge by, and how to read them together.

Read the article →02 · Area F

Undercharge or restriction? Telling two starved evaporators apart

Low suction pressure and high superheat can mean a leak or a restriction. Subcooling and a temperature drop across the drier tell you which.

Read the article →03 · Area B

Reading a vacuum decay test: leak or moisture?

What a micron gauge is telling you after you valve off the pump, why the compound gauge can't, and how to set up an evacuation that finishes.

Read the article →

Five questions. Three minutes. No account.

Your strongest and weakest area in the sample, and one answer fully explained with its sources. Free during the preview.

Start the sample →