AC Fridge Washing Machine Repair Course

Lesson 1 • Refrigeration Cycle Principles

Explains the vapour-compression cycle: evaporation, compression, condensation, and expansion. Understanding this cycle is prerequisite to diagnosing any refrigeration fault.

Lesson 2 • Workplace Safety and Personal Protective Equipment

Establishes safety protocols for electrical, chemical, and mechanical hazards in appliance repair. Safe work habits introduced here apply to every hands-on activity in the course.

Lesson 3 • Tools and Test Equipment Overview

Introduces multimeters, clamp meters, and refrigerant gauges used throughout the course. Proper tool selection and calibration directly affect diagnostic accuracy.

Lesson 4 • Basic Electrical Concepts for Technicians

Covers voltage, current, resistance, and power relationships essential for appliance repair. Establishes the electrical foundation required for all diagnostic work in later chapters.

Lesson 1 • Electrical Controls and Sensors in AC Units

Identifies thermistors, pressure switches, capacitors, contactors, and control boards in AC systems. These components are the most frequent sources of electrical faults.

Lesson 2 • Expansion Devices and Refrigerant Flow Control

Covers capillary tubes, thermostatic expansion valves, and electronic expansion valves. Proper refrigerant metering is critical to system efficiency and compressor protection.

Lesson 3 • Compressor Types and Functions

Covers reciprocating, rotary, scroll, and inverter compressors and their operating characteristics. Compressor knowledge is central to diagnosing the most costly AC failures.

Lesson 4 • Heat Exchangers: Evaporator and Condenser

Explains coil construction, airflow requirements, and heat exchange efficiency for both coils. Coil condition directly affects system capacity and energy consumption.

Lesson 1 • Refrigerator Compressor and Sealed System

Covers hermetic compressor construction, starting components, and sealed system integrity. The sealed system is the core of refrigerator cooling performance.

Lesson 2 • Refrigerator System Configurations

Compares single-door, top-freezer, bottom-freezer, side-by-side, and French-door models. Configuration determines component layout and the sequence of diagnostic steps.

Lesson 3 • Defrost System Components and Cycle

Explains defrost heaters, thermostats, timers, and adaptive defrost controls. Defrost system failures are among the most common causes of refrigerator cooling loss.

Lesson 4 • Airflow, Fans, and Damper Controls

Covers evaporator fan motors, condenser fan motors, and damper assemblies that regulate compartment temperatures. Restricted airflow causes temperature complaints in most refrigerators.

Lesson 1 • Tub, Drum, Bearings, and Suspension

Covers outer tub construction, drum bearings, spider arms, shock absorbers, and suspension springs. Mechanical wear in these parts causes noise and vibration complaints.

Lesson 2 • Water Inlet and Drain Systems

Covers inlet valves, water level pressure switches, drain pumps, and hose routing. Water system faults account for a large share of washer service calls.

Lesson 3 • Drive Systems: Motors, Belts, and Transmissions

Explains induction motors, universal motors, BLDC motors, belts, and transmission assemblies. The drive system converts electrical energy into drum or agitator motion.

Lesson 4 • Washer Types and Design Differences

Compares top-load agitator, top-load impeller, and front-load drum washer designs. Design type determines which components are present and which faults are most likely.

Lesson 1 • Mechanical and Noise Diagnostics

Identifies bearing failure, belt wear, imbalance, and loose components through sound and vibration analysis. Mechanical diagnosis prevents misattributing noise faults to electrical causes.

Lesson 2 • Symptom-Based Diagnostic Approach

Teaches structured symptom collection, customer interview techniques, and fault tree analysis. Symptom-based thinking reduces unnecessary disassembly and part replacement.

Lesson 3 • Electrical Diagnostic Techniques

Covers voltage testing, continuity checks, resistance measurement, and signal tracing on live circuits. Electrical diagnosis is the fastest path to isolating most appliance faults.

Lesson 4 • Using Service Manuals and Wiring Diagrams

Teaches how to locate, read, and apply wiring diagrams, component location guides, and diagnostic flowcharts. Manual-based diagnosis ensures accuracy across unfamiliar appliance models.

Lesson 1 • Leak Detection and Repair Techniques

Uses electronic leak detectors, UV dye, and nitrogen pressure testing to find and repair refrigerant leaks. Unrepaired leaks cause repeat service calls and environmental harm.

Lesson 2 • Compressor Replacement Procedure

Details compressor removal, oil equalisation, electrical connection, and startup verification. Compressor replacement is the highest-value AC repair skill in the field.

Lesson 3 • Refrigerant Charging Methods

Teaches weight-based charging, superheat method, and subcooling method for accurate refrigerant charge. Correct charge level is essential for efficiency and compressor longevity.

Lesson 4 • Refrigerant Recovery and Evacuation

Covers recovery machine operation, vacuum pump use, and micron gauge readings to prepare a system for repair. Proper evacuation removes moisture and non-condensables before recharge.

Lesson 1 • Washer Drive and Mechanical Repair

Covers motor replacement, belt replacement, bearing replacement, and shock absorber swap in washers. Drive and mechanical repairs resolve noise, vibration, and spin failure complaints.

Lesson 2 • Refrigerator Sealed System Repair

Covers refrigerant recovery, filter drier replacement, leak repair, evacuation, and recharge for refrigerators. Sealed system work requires all refrigeration skills from previous chapters.

Lesson 3 • Defrost System Repair and Testing

Replaces defrost heaters, thermostats, timers, and control boards and verifies correct defrost cycle operation. Defrost repairs restore cooling in frost-free refrigerators without sealed system work.

Lesson 4 • Refrigerator Fan and Thermostat Repair

Replaces evaporator fans, condenser fans, dampers, and thermostats to restore proper airflow and temperature control. Fan and thermostat repairs are among the most common refrigerator service tasks.

Lesson 1 • Inverter Compressor Diagnostics and Repair

Covers inverter board testing, compressor winding resistance checks, and fault code retrieval for inverter AC systems. Inverter faults require different test methods than fixed-speed systems.

Lesson 2 • Smart Appliance Control Systems

Covers Wi-Fi module diagnostics, firmware update procedures, and sensor network faults in connected appliances. Smart features add diagnostic complexity but also provide remote fault data.

Lesson 3 • Complex Fault Scenarios and Case Studies

Applies all diagnostic and repair skills to multi-fault scenarios drawn from real service cases. Case study practice builds the judgment needed for independent field service.

Lesson 4 • Variable-Speed Washer Motor Systems

Diagnoses BLDC motor faults, inverter drive board failures, and Hall sensor errors in direct-drive washers. Variable-speed systems require oscilloscope or advanced meter techniques.