Lesson 1Estimating repair time and labor tasks for common AC fixesLearn to gauge real repair times and work tasks for usual inverter AC repairs. Divide diagnostics, taking apart, swapping parts, testing, and cleaning to quote labour right and plan your day's jobs well in busy Eritrean homes.
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 itemsDecide which AC spare parts to keep in your vehicle for quick fixes. Classify top, medium, and order-only items by break rates, price, space, and how fast clients want repairs done in Eritrea's hot weather.
Classifying high-priority fast-moving sparesMedium-priority and brand-specific partsOrder-only, bulky, or rare componentsOrganizing and labelling van inventoryReviewing stock based on past repairsLesson 3Safety, refrigerant regulations, and documentation practices for field repairsAbide by safety rules and cooling gas laws during on-site fixes. Master personal gear, leak management, recovery and filling rules, labelling, and proper records to comply and safeguard clients and Eritrea's environment.
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 weak parts in inverter ACs and test them swiftly. Use quick check shortcuts for boards, sensors, fans, and compressors to focus tests and cut time on each service call in Eritrean fields.
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 signs and tie them to causes. Examine weak cooling, bubbling or whistling noises, and units halting after running, then link each to power, cooling gas, or air flow problems.
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 cooling gauges and thermometers to assess system state. Master static and running pressure tests, superheat and subcooling measures, and judge cooling gas levels and blocks without overfilling the unit.
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 gainful and fair preventive care routines for split inverter ACs. Cover filter and coil upkeep, drain clearing, basic cooling gas checks, and how to bundle and explain service deals that benefit clients.
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, truthful, and polite manner. Practice explaining faults, suggesting repair levels, addressing concerns, and noting approvals to foster lasting client trust.
Explaining diagnosis in simple languageOffering good, better, best repair optionsDiscussing parts, labor, 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 for better diagnostics. Study inverter compressor kinds, PCB and power units, variable speed running, sensors, and how the system adjusts power and draw under varying loads in Eritrea.
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 multimeter and clamp meter on inverter ACs. Check power supply, capacitors, fan motors, compressor current, and read values to spot overload, imbalance, or failing electrical parts accurately.
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 orderly on-site visual inspections before deep tests. Look for leaks, frost, wire harm, drain problems, air blockages, and access issues while keeping safe around powered gear and steps in Eritrean sites.
Exterior inspection of indoor and outdoor unitsChecking for oil stains and refrigerant leaksIdentifying frost, ice, and airflow blockagesInspecting wiring, terminals, and insulationDrainage, leveling, and mounting checksSafe ladder and work area practicesLesson 12Confirming faults: isolating PCB vs sensor vs mechanical issues using step-by-step testsEmploy structured tests to pinpoint if faults stem from PCB, sensors, or mechanical parts. Follow step-by-step isolation, cross-verify readings, and skip needless board or compressor swaps in field work.
Reading and interpreting error codesTesting thermistors and pressure sensorsIsolating indoor vs outdoor PCB faultsDistinguishing electrical vs mechanical issuesAvoiding unnecessary board replacement
