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That is model on coil.
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:
Just above that number
There it is Let me grab a manual
OK we have an alternating slow and an alternating fast?
Which would you say?
OK lets turn power off to furnace to reset board Code means
Watchguard −− burners failed to ignite or lost flame 5 times during single heating
Then call for heat and tell me how far in sequence it goes.
1. Inducer starts
4.Circulating blower is energized.
Ok do you get the error code that it has tried to light 5 times , the very first attempt after restoring power to furnace?