Red Seal Plumbing Practice Exam

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When troubleshooting a mid efficiency furnace, what is the most useful tool?

Multimeter
Thermometer
Manometer
LED diagnostic chart

The correct answer is: LED diagnostic chart

When troubleshooting a mid efficiency furnace, using a multimeter to test various electrical components is a helpful tool. However, it may not provide a complete understanding of the problem. A thermometer can help determine if the furnace is producing the correct temperature, but it does not provide information about the underlying issue. A manometer is useful for measuring gas pressure, but may not be necessary for all furnace problems. LED diagnostic charts provide a detailed breakdown of error codes and can help pinpoint specific issues, making it the most useful tool for troubleshooting a furnace.