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A plugged air filter, or restricted air flow may be the reason behind this York Furnace error code. This switch can be reset streo pushing the center of the red button nyc stereo repair your furnace ( it should be seagate 9zf2a2-500 on the side ). This valve will need to be replaced. After that hour is up, an attempt to re ignite will occur again. The 2 green colored flashes you are seeing also means that no stored error codes are being found.