Learning
Appliance Repair 101: the vocabulary without unsafe live testing
Understand what a technician or service manual is talking about before deciding what the next safe step should be.
| Term | Plain-English meaning |
|---|---|
| Continuity | An electrical path exists between test points. It does not by itself prove a component works correctly under load. |
| Resistance | Opposition to electrical current, measured in ohms. Expected values are model/component-specific. |
| Thermistor | Temperature-sensitive resistor used by controls to infer temperature. |
| Relay | Electrically controlled switch used to turn loads on/off. |
| Solenoid | Electromagnetic actuator used in valves, locks and other mechanisms. |
| Inverter | Power electronics that can control motor/compressor speed. |
| Harness | Bundle of wires/connectors linking components. |
| Interlock | Safety/control device that prevents operation unless required conditions are met. |
| Sump | Low collection area where water gathers before recirculation/draining. |
| Impeller | Rotating part that moves water or air in a pump/fan. |
| Defrost | Controlled removal of frost/ice from a refrigeration evaporator. |
| Sealed system | Closed refrigerant circuit containing compressor, tubing and heat exchangers. |
A diagnostic mindset
- Start with the symptom and exact model.
- Separate the affected system from the assumed failed part.
- Check installation and user-maintenance items first when the manual allows.
- Use error codes as clues, not verdicts.
- Escalate when the task crosses into live electrical, gas, sealed refrigeration, microwave high-voltage or significant disassembly.
Knowing a term is not the same as being qualified to test it: This section explains language; it intentionally does not provide live-circuit test instructions.