There is a LED display for error codes that is located on the outdoor main board.
Remove the top cover of the outdoor unit to gain access to the main board in the control box.
JUMPER - if missing from
the spare part pc board,
remove from factory
installed pc board.
950-0203-revK
ERROR CODES ON OUTDOOR PC BOARD
Main Board inside the control box.
LED Display
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March 1, 2016