Lesson 1Estimating repair time and labour tasks for common AC fixesLearn to estimate practical repair times and labour for typical inverter AC jobs. Break down diagnostics, taking apart, replacing parts, testing, and cleaning to quote labour correctly and manage your daily schedule efficiently in the field.
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 stock in your vehicle for quick fixes. Classify high-priority, medium-priority, and order-only items based on failure rates, costs, storage space, and how soon customers want repairs done in Namibian homes.
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 repairsAdhere to safety guidelines and refrigerant rules during on-site repairs. Cover personal protective gear, leak management, recovery and charging procedures, labelling, and proper documentation to remain compliant and safeguard customers and the environment in Namibia.
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 failure parts in inverter ACs and test them swiftly. Use quick diagnostic tips for PCBs, sensors, fans, and compressors to focus checks and cut down time on each service call in busy Namibian schedules.
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 runtimeIdentify usual inverter AC fault patterns and connect symptoms to causes. Examine weak cooling, gurgling or hissing noises, and units halting after running, linking each to electrical, refrigerant, or airflow problems common in local conditions.
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 assess system condition. Perform static and operating pressure tests, measure superheat and subcooling, and determine refrigerant levels and blockages without overfilling the system during repairs.
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 contractsCreate profitable yet honest preventive maintenance for split inverter ACs. Include filter and coil maintenance, drain cleaning, basic refrigerant inspections, and ways to present service contracts that benefit customers in Namibia's climate.
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 respectfullyMaster presenting repair results, choices, and costs in a straightforward, honest, and polite manner. Practice describing faults, suggesting repair levels, addressing concerns, and recording agreements to foster lasting customer trust in your services.
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 operationGrasp how inverter split AC systems function to make diagnostics logical. Study inverter compressor varieties, PCB and power units, variable speed control, sensors, and how the system adjusts capacity and power use under varying loads in hot Namibian weather.
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 analysisSafely use a multimeter and clamp meter on inverter ACs. Check supply voltage, capacitors, fan motors, compressor current, and analyse readings to find overloads, imbalances, or failing electrical parts during field work.
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 componentsConduct thorough on-site visual inspections before advanced tests. Look for leaks, frost, wiring damage, drainage problems, airflow obstructions, and access issues while maintaining safety around live equipment and ladders in Namibian 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 testsApply methodical tests to pinpoint if faults stem from PCB, sensors, or mechanical parts. Follow isolation steps, verify readings, and prevent needless replacement of boards or compressors to save time and costs.
Reading and interpreting error codesTesting thermistors and pressure sensorsIsolating indoor vs outdoor PCB faultsDistinguishing electrical vs mechanical issuesAvoiding unnecessary board replacement
