Lesson 1Choosing and Getting Parts: Spotting Original vs Matching Parts, Reading Part Codes and Detail SheetsBuild skills to pick correct replacement parts using model labels, original maker lists, and detail sheets, compare original and market options, check electrical and mechanical fit, and dodge usual ordering and swap errors in Namibian shops.
Locating and decoding appliance model tagsReading OEM part numbers and revisionsUsing exploded views and parts diagramsComparing OEM and aftermarket componentsVerifying electrical and mechanical compatibilityLesson 2Compressor and Starter Testing: Start Relay/Capacitor Check, Amp Flow Testing, Stuck Rotor SpottingLearn to test fridge compressors and starter parts with meters and clamp tools, spot broken relays and capacitors, notice stuck-rotor problems, and decide when a compressor is too damaged electrically or mechanically to fix.
Identifying compressor terminals and winding layoutTesting PTC and mechanical start relaysStart and run capacitor inspection and testsMeasuring compressor amp draw and LRADiagnosing locked rotor and internal shortsLesson 3Customer Talk Guides: Easy Explanation of Cause, Suggested Fixes vs New Unit, Cost/Benefit and Care Tips to Stop Repeat IssuesCreate clear, professional talk habits with customers by explaining faults in easy words, showing fix versus new options, guessing costs, and giving care tips that cut future breakdowns and return visits in local settings.
Explaining diagnosis in non-technical termsDiscussing repair versus replacement choicesPresenting written estimates and optionsSetting realistic timelines and outcomesProviding preventive maintenance adviceLesson 4Electrical and Sensor Checks: Multimeter Tests for Flow/Resistance of Defrost Heater, Thermistor Testing, Fan Motor Current FlowPractice safe electrical checks using a multimeter and clamp meter to test flow, resistance, and current on defrost heaters, thermistors, fan motors, and wires, telling normal readings from open, shorted, or off components.
Multimeter safety and test lead setupContinuity and resistance checks on heatersThermistor resistance versus temperature chartsFan motor voltage and current measurementsTesting door switches and harness connectionsLesson 5Reading Signs: Warm Food Area, Cold Freezer with Back Ice, Non-Stop Compressor RunLearn to read common fridge signs like warm food space, icy back walls, noisy or constant running, and on-off cooling, then link each to likely air flow, defrost, control, or sealed system problems.
Warm fresh food, normal freezer analysisBack-wall ice and airflow restriction cluesContinuous or near-continuous run-timeShort cycling and frequent startsNoises, vibrations, and rattlesIntermittent cooling and nuisance tripsLesson 6Usual Problems: Compressor, Evaporator Frost/Defrost Setup, Evaporator Fan, Temp Sensors, Thermostats, and Gas LeaksLink typical fridge signs to likely broken parts, including compressor issues, evaporator frost problems, fan breaks, sensor errors, and gas leaks, and learn to rank tests that confirm or rule out each suspected issue.
No cool or warm cabinet in both sectionsWarm fresh food, cold or icy freezerShort cycling and long run-time issuesNoisy operation and vibration complaintsIntermittent cooling and nuisance tripsSigns suggesting sealed system leaksLesson 7Heat Science of Home Fridge Systems and Air Flow WaysGrasp how heat shifts in home fridges, including pressure-temp links, evaporator and condenser jobs, and cabinet air flow patterns, so you can tie poor cooling, icing, and short runs to specific heat science faults.
Basic refrigeration cycle and key componentsPressure–temperature relationship in systemsEvaporator loading and frost formationCondenser heat rejection and ambient effectsAirflow paths in fresh food and freezerImpact of door openings and loadingLesson 8Fix Steps: Swapping Defrost Heater, Thermistor, Evaporator Fan, Door Seal; Steps to Recover/Recharge Gas (Limits and Expert Choice)Study step-by-step fix methods for common breaks, including swapping defrost heaters, thermistors, evaporator fans, and door seals, and know when gas recovery or recharge needs licensed experts.
Safe disassembly and panel removalReplacing defrost heaters and wiringThermistor access, testing, and replacementEvaporator and condenser fan replacementDoor gasket removal and installationScope limits for sealed system repairsLesson 9Safety Steps: Electrical Cut-Off, Gas Handling Rules, Protective Gear, Pressure Release and Recovery BasicsUse key safety ways for fridge service, including electrical cut-off, lockout practices, protective gear choice, safe handling of sharp metal and moving parts, and basic gas safety and rule duties.
Lockout, tagout, and unplugging routinesVerifying absence of voltage before workPPE for electrical and sharp-edge hazardsSafe handling of fans and moving partsBasics of refrigerant exposure risksRecordkeeping and regulatory dutiesLesson 10Defrost Setup Check Plan: Timer, Bi-Metal/Thermostat, Defrost Heater, Control Board ChecksFollow a step plan to check defrost setup faults by testing timers or control boards, defrost heaters, bi-metal thermostats, and sensors, telling electrical breaks from control logic issues causing evaporator ice.
Recognizing symptoms of defrost failureLocating defrost components by designTesting defrost heaters for continuityChecking bi-metal and defrost thermostatsForcing defrost mode from control boardInterpreting timer and control board faultsLesson 11Visual Check List: Seals, Door Fit, Ice Build-Up, Drain and Defrost Heater SpotsUse a planned visual list to quickly spot common fridge issues, including seal leaks, door misfit, ice build-up, blocked drains, damaged wires, and dirty condensers, cutting return visits and guiding deeper checks.
Inspecting door gaskets and sealing surfacesChecking door alignment and hinge wearIdentifying ice buildup and airflow blockagesExamining drain pan, tube, and outletsInspecting wiring, connectors, and insulationLesson 12Gas Setup Checks: Static Pressure Reads, Leak Spot Methods, When to Call Certified Gas ExpertLearn basic sealed setup checks within law limits, including static and run pressure reads, temp split views, simple leak spot methods, and knowing when to stop and call a certified gas expert.
Recognizing sealed system componentsSafe use of service ports and gaugesStatic and running pressure interpretationTemperature split and line frost patternsNon-invasive leak detection techniquesWhen to involve certified techniciansLesson 13After-Fix Tests and Proof: Temp Steady Testing, Run-Time Watch, Sealing and Air Flow CheckProve successful fixes by watching cabinet temps, run-time, and defrost work, checking door seals and air flow, and noting reads so you can close the job surely and cut risks of returns or repeat breaks.
Stabilization time and temperature loggingChecking thermostat and sensor responseMonitoring compressor and fan run-timeVerifying door seal and light operationConfirming defrost cycle performanceFinal documentation and customer sign-off
