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Troubleshooting Guide Troubleshooting Guide For Goodman Furnace . 9 rows goodman furnace fault code: Now that you have a basic understanding of the error codes, it’s time to learn how. Goodman Air Conditioner Error Codes from acerrorcode.com The flashing leds on your furnace will correspond to a specific fault code that is shown here on their diagnostic chart.goodman is one of the biggest names i. Goodman air conditioner error codes. Turn off power and check connections.