Troubleshooting Gas Furnaces Accurately and Efficiently

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1. Which of the following components is NOT part of the low-voltage circuit in gas furnaces?

2. Ignitors are faster nowadays because their voltage is _____ instead of 80v.

3. Jim Fultz says we should use test tools to ____________ what we ___________.

4. What is the most common spot for a short in heating mode?

5. True or False: The best time to test amperage is when the unit is off.

6. The following situations are all ones where you would measure continuity EXCEPT:

7. What is a logical troubleshooting step if the ignitor (hot surface or HSI) is not glowing?

8. True or False: Nowadays, many ignitor manufacturers make silicon nitride HSIs because the material is non-porous, denser, and less likely to crack than silicon carbide.

9. If you have a constant-torque ECMx blower, what should you attempt to verify IN ADDITION TO 120v going to the blower?

10. Which of the following is a sign of a failed capacitor?

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