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This means "an external shut down fault".
Here is copy of the description
This means no power is at or recognized by the air handler. It could be power to unit, bad switch, fuse, breaker, door interlock or board.
It will require checking with a meter to find the missing power
if you can wait a few i will them
Most common is at the switch/fuse.
Start at the breaker..make sure 220v avail. Then go to switch..then to next connection. Just follow the wires and test at each stop/connection.
I see the question is still open. Can you please rate service at top of page to close for me?
That is great news...really good find.
Just rate service at top of page and I can move off the active list.