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Maintenance and Troubleshooting: Wiring Diagrams


Maintaining and Troubleshooting Domestic Refrigerators: Chapter 1


Maintenance and Troubleshooting: Wiring Diagrams


In this module, we will review wiring diagrams. We will learn how to use a wiring diagram to troubleshoot a system. Skip to quiz!

Overview


Recall that a wiring diagram is a blueprint of an electrical system. Wiring diagrams display:

  • The components in a system,

  • The wiring, and

  • The flow of current


There are different symbols for each component of the refrigerator. As the system gets more and more complex, it gets hard to remember each of these symbols. For this reason, some of the wiring diagrams come with a legend.


The legend identifies which symbols are used and what they represent. The legend does not explain what every symbol means.



Troubleshooting


The wiring diagram is often used for troubleshooting the electrical and control system of the refrigerator. Most refrigerators and freezers have wiring diagrams printed to the back. If they are not present, we can get them in the service manual provided by the manufacturer or on the internet.


The lines represent wires that connect electrical components in the appliance. We need to follow the wires to troubleshoot our appliance.


When we are troubleshooting an electrical problem in an appliance, a multimeter is an essential tool. For example, if the component inside the refrigerator isn’t working, a break in the wires may be one of the causes. Checking continuity allows us to test whether current is making it all the way through a wire.


When you measure continuity, the meter will display either:

  • “OL”

  • A low number and a beep sound


Recall that if the multimeter reads “OL,” the component or wire you are checking does not have continuity. If your multimeter reads a low value and emits a beep sound, then the component you checked has continuity.


The wiring diagram is often used for troubleshooting the electrical and control system of the refrigerator. The wiring diagram will show you the components in a system and how they are wired.


When we are troubleshooting an electrical problem in an appliance, a multimeter is an essential tool.


 

Question #1: Where does the wiring diagram of any HVAC system display?

  1. The components in a system

  2. Size of the components in the system

  3. Material of the components

  4. The wiring

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Answer: The components in a system

The wiring

Wiring diagrams display:

  • The components in a system,

  • The wiring, and

  • The flow of current


Question #2: What is the purpose of legend in the wiring diagram?

  1. To identify the size of the components

  2. To identify symbols of the components and what they represent.

  3. To show the material of the components

  4. To display voltage and current

Scroll down for the answer...
















Answer: To identify symbols of the components and what they represent.

The legend identifies which symbols are used and what they represent. The legend does not explain what every symbol means.


Question #3: How do we troubleshoot an electrical problem in the domestic refrigerator?

  1. Using grease gun

  2. Using thermometer

  3. Using a multimeter

  4. Using a calculator

Scroll down for the answer...
















Answer: Using thermometer

The legend identifies which symbols are used and what they represent. The legend does not explain what every symbol means.


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