Continuity Readings

To perform an ohmmeter continuity test, set your multimeter to resistance; disconnect the power and remove the wires from the component being tested. Perform a continuity test as follows:

1. Place the meter probes across a path. If a reading is obtained, it indicates an open path.

Place one meter probe on the left side of the CR contact and the other probe on the left side of the HP switch. If you obtain a reading, the path is open.

2. Place the meter probes across a path. If a zero reading is obtained, the path is closed.

Place one meter probe on the left side of the CR contact and the other probe on the left side of the HP switch. With the CR contact closed, you should obtain a zero reading. This indicates the path is closed. 14-18(D)

3. Place the meter probes across a load. You should obtain a reading.

Place one meter probe on the right side of the LLP and the other probe on the left side of the IT. You should obtain a reading. If you obtain no reading, replace the load.

To further increase your understanding of electrical troubleshooting, review the rules you have just read using a different method. The flow charts in figure 14-30(A), and (B) review electrical troubleshooting with a digital multimeter. To use a multimeter effectively and troubleshoot an A/C & R unit electrically, you must not only know the information provided here but also practice by testing circuits. Always remember to respect electricity. Whenever possible, perform your electrical troubleshooting with the power OFF using continuity checks.

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