How to Troubleshoot Carrier Furnace

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I have a Carrier Furnace and it has a solid yellow LED light

Carrier furnace diagnostic code 31 or 3-1.

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Carrier furnace does not turn on Code 23 "Pressure Switch Did Not Open" I fixed it myself for free.

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Carrier Gas Furnace Error Code Diagnose | HVAC | Carrier Furnace

Reversed Polarity and Ignition Problems. No Heat. EP70