Split diagnosis and repair: no cooling, freezing up, leaking — refrigerants, environment and good practice
Technical trades

Split diagnosis and repair: no cooling, freezing up, leaking — refrigerants, environment and good practice

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E-Nogueira
Created by E-Nogueira
$45.3

What you will learn?

Follow a diagnostic tree from symptom to cause, measuring in the right order and without opening the circuit needlessly.
Convert pressure to temperature, calculate superheat and subcooling, and identify low charge, overcharge, restriction or low airflow.
Locate a leak with a detector, soap solution and nitrogen, and repair it with a new flare fitting or brazing under nitrogen.
Recover refrigerant with a recovery machine, pull a measured vacuum and recharge by weight, complying with the environmental rules.
Test the capacitor, contactor, motors, compressor, NTC sensors and the power module with a multimeter and clamp meter.
Issue a report and a quote and decide, with numbers, between repairing and recommending replacement.

About this course

Every technician knows the colleague who "topped up the gas" three times on the same unit, and the one who replaced the board while the fault carried on. Both skipped the diagnosis. This course teaches a method: from symptom to measurements, from measurements to cause, from cause to repair, and only then to the part.

You learn the diagnostic tree for the seven symptoms that arrive on WhatsApp (no cooling, weak cooling, freezing up, water leak, shutting off, noise, error code), how to read pressures, superheat and subcooling on R-410A and R-32, how to find and repair a leak with brazing under nitrogen, how to recover, pull a vacuum and weigh the charge, how to test the capacitor, motors, compressor and the sensors of the inverter board, and how to comply with the environmental rules for refrigerants. It closes with three cases solved from start to finish and with the report, quote and warranty term. It does not teach component-level board repair or VRF and central systems.

Requirements

Have completed CL2 (preventive-maintenance measurements), CL3 (flare, vacuum and charge) and CL4 (circuit, interconnection and earthing), or have equivalent installation experience.
Tools for the tasks: manifold for R-410A/R-32, vacuum gauge, vacuum pump, scale, contact thermometer with two probes, multimeter with capacitance and diode ranges, and a CAT III 300 V or higher clamp meter. Recovery machine, recovery cylinder, nitrogen with regulator and brazing kit for the Module 2 tasks (your own or working alongside a professional).
NR-10 training (the Brazilian electrical safety regulation) to work on electrical installations, and NR-35 (Brazilian work-at-height regulation) for work above 2 m with risk of falling. Outside Brazil, follow your local equivalent.

FAQ

They are the foundation. CL6 assumes you already measure current and delta T (CL2), already make a flare with torque, vacuum and charge by weight (CL3), and already know how the circuit and interconnection are wired (CL4). Here those things appear as diagnostic tools and are not taught again.
Not at component level. You learn to prove whether the board is the culprit: sensors, voltages, communication, power module and compressor. Replacing components on the board (SMD soldering, reballing) is another specialty.
No. The focus is the hi-wall split and the floor-ceiling and cassette splits up to about 60,000 BTU/h. The method (symptom, measurement, cause) applies to any system, but VRF and central systems have their own piping, controls and charge and appear only as a mention.
No. All refrigerant that leaves the circuit goes into a recovery cylinder. A 12,000 BTU/h split with 0.8 kg of R-410A is equivalent to about 1.7 tonnes of CO₂ if released into the air. Lesson 4 shows how to recover it and what the law says.
The method and the physics apply in any country: the pressure-temperature table for R-32 is the same worldwide. The refrigerant, work and consumer rules are Brazilian. Outside Brazil, check your local refrigerant and consumer-protection regulations.

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The diagnostic tree: symptom, measurement, cause
15 Min
Pressures, superheat and subcooling: R-410A and R-32
15 Min
Module 1 quiz
5 Questions
What to deliver:
Leaks: where they happen, how to find them and how to repair them
15 Min
Recover, evacuate, weigh: the right charge and environmental rules
15 Min
Module 2 quiz
5 Questions
What to deliver:
Capacitor, contactor and motors: multimeter tests
15 Min
Inverter: sensors, error codes and IPM in the field
15 Min
Module 3 quiz
5 Questions
What to deliver:
Freezing up, water leaks, tripping: three cases from start to finish
15 Min
Report, quote and warranty: repair or recommend replacement
15 Min
Module 4 quiz
5 Questions
What to deliver:
Final quiz
10 Questions
Final project — 3 documented diagnoses: Integrating task

Certificate

Official certificate

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$45.3

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