Lesson 1Estimating repair time and labour tasks for common AC fixesFigure out realistic times and labour for common inverter AC jobs. Break down checking, taking apart, changing parts, testing, and cleaning so you can quote labour right and plan your daily work well, especially with Nigeria's power and traffic issues.
Time estimates for standard diagnosticsTypical durations for common repairsAllowances for access and site conditionsPlanning visits and daily job schedulingLesson 2Parts priority and vehicle stocking: high-priority spares to carry vs order-only itemsPlan which AC spare parts to keep in your van for quick fixes. Learn to sort high-priority, medium-priority, and order-only items based on how often they fail, cost, space in your vehicle, and how fast customers in Nigeria want their AC repaired.
Classifying high-priority fast-moving sparesMedium-priority and brand-specific partsOrder-only, bulky, or rare componentsOrganising and labelling van inventoryReviewing stock based on past repairsLesson 3Safety, refrigerant regulations, and documentation practices for field repairsFollow safety rules and cooling gas laws during field repairs. Learn about protective gear, handling leaks, recovering and adding gas rules, labelling, and proper record-keeping to stay legal and protect customers and the environment in Nigeria.
Personal protective equipment for AC workSafe handling of refrigerant cylindersLeak response and environmental dutiesRecovery, recycling, and charging rulesService reports and job documentationLesson 4Typical replacement parts and failure likelihoods for inverter ACs and fast diagnosticsSpot common parts that fail often in inverter ACs and test them quickly. Learn fast checking shortcuts for circuit boards, sensors, fans, and compressors so you can focus checks and cut time on each service call in busy Nigerian homes.
High-failure electronic and sensor componentsCommon fan motor and bearing problemsTypical compressor and start failuresQuick tests to confirm suspect partsUsing patterns from brand service historyLesson 5Common fault patterns: weak cooling, gurgling sounds, unit stopping after runtimeRecognise common inverter AC fault patterns and connect symptoms to likely causes. You'll study weak cooling, gurgling or hissing noises, and units that stop after running a bit, then link each to electrical, refrigerant, or air flow problems common in Nigeria.
Weak cooling with normal power consumptionGurgling or hissing sounds in pipingUnit stopping after short or long runtimeIntermittent cooling and random restartsPatterns linked to sensor or PCB issuesLesson 6Refrigeration checks with gauges and thermometer: static pressure, superheat/subcooling, refrigerant level diagnosisUse refrigeration gauges and thermometers to check system health. Learn static and running pressure tests, superheat and subcooling measurements, and how to judge cooling gas level and blockages without overfilling the system, vital for hot Nigerian weather.
Safe connection of gauges to service portsStatic pressure checks and what they showMeasuring running pressures correctlyCalculating superheat and subcoolingDiagnosing charge level and restrictionsLesson 7Preventive maintenance upsells specific to ACs: filter care, coil cleaning, refrigerant checks, and service contractsBuild profitable and honest preventive maintenance for split inverter ACs. Learn filter and coil care, drain cleaning, basic refrigerant checks, and how to package and explain service contracts that add real value for customers in Nigeria.
Filter inspection, cleaning, and replacementIndoor and outdoor coil cleaning proceduresDrain pan and condensate line maintenanceBasic refrigerant health checks during serviceDesigning and pricing AC service contractsExplaining maintenance plans to customersLesson 8Presenting AC repair options and pricing to customers clearly and respectfullyLearn to present repair findings, options, and prices in a clear, honest, and respectful manner. Practice explaining faults, offering repair levels, handling objections, and recording approvals to build long-term trust with Nigerian customers.
Explaining diagnosis in simple languageOffering good, better, best repair optionsDiscussing parts, labour, and warranty termsHandling price objections professionallyDocumenting approvals and declined workLesson 9Understanding inverter AC systems: compressor types, PCB/inverter board, variable speed operationUnderstand how inverter split AC systems function so diagnostics are clear. Study inverter compressor types, PCB and power modules, variable speed operation, sensors, and how the system adjusts capacity and power use under different loads in Nigeria.
Fixed-speed vs inverter compressor basicsRole of the main PCB and inverter moduleHow variable speed controls capacityKey sensors and their functionsImpact of load and ambient on operationLesson 10Electrical tests with multimeter and clamp meter: supply checks, capacitor/function of fans, compressor current and run analysisLearn to safely use a multimeter and clamp meter on inverter ACs. Check supply voltage, capacitors, fan motors, compressor current, and read results to spot overload, imbalance, or failing electrical parts common in Nigerian setups.
Safety checks before live electrical testingMeasuring supply voltage and phase balanceTesting capacitors and fan motor windingsMeasuring compressor starting and running currentInterpreting abnormal current and voltage readingsLesson 11On-site visual checks and safety: leaks, frost, wiring, drainage, airflow, accessible componentsDo systematic on-site visual checks before deeper tests. Inspect for leaks, frost, wiring damage, drainage problems, air flow blocks, and access issues while following safe practices around live equipment and ladders in Nigerian homes.
Exterior inspection of indoor and outdoor unitsChecking for oil stains and refrigerant leaksIdentifying frost, ice, and airflow blockagesInspecting wiring, terminals, and insulationDrainage, levelling, and mounting checksSafe ladder and work area practicesLesson 12Confirming faults: isolating PCB vs sensor vs mechanical issues using step-by-step testsUse structured tests to confirm if faults are from the PCB, sensors, or mechanical parts. Follow step-by-step isolation methods, cross-check readings, and avoid needless board or compressor changes in field repairs.
Reading and interpreting error codesTesting thermistors and pressure sensorsIsolating indoor vs outdoor PCB faultsDistinguishing electrical vs mechanical issuesAvoiding unnecessary board replacement
