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The flashing LEDs on your  furnace will correspond to a specific fault code that is shown here on their diagnostic chart

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• YORK Fault Codes

• Armstrong Fault Codes

• Trane Fault Codes

• Rheem Fault Codes

• Lennoxslp98uhv Fault Codes

• Lennoxg61g60uhv Fault Codes

• Lennoxg43g51 Fault Codes

• Lennoxg26 Fault Codes

• Mid Efficient Keeprite Fault Codes

• Goodman Fault Codes

• Bryant Fault Codes

• Carrier Fault Codes

• Ruud Fault Codes

• Payne Fault Codes

• Lennoxg71mpp Fault Codes

• Lennoxg50 Fault Codes

• Lennoxg40 Fault Codes

• Keeprite high eff Fault Codes

• Heil Fault Codes

• Ducane Fault Codes