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Can you give me the complete model number on the furnace? It will be on a label on inside furnace panel just above burners.Remove panel to burner compartment and look inside. The model number will help me give accurate assistance for your specific unit.
Below is a link showing where to find label with model number:
Also do this. Turn thermostat to OFF and then cycle power to furnace at breaker or switch and tell me if error code goes away.