Raytheon SC18EC Operating Instructions Manual page 21

Operation
E:Pr—When the computer receives input
from the water level switch indicating that
the switches are opening in an incorrect
sequence, the computer aborts the cycle and
displays "E:Pr."
E:dr—When the computer has not received
input from the water level switch indicating an
empty condition 31 minutes into a drain step,
the computer aborts the cycle and displays
"E:dr."
E:do—When the computer senses that the
door has opened while a cycle is in progress,
the computer aborts the cycle and
displays "E:do."
E:SP—When the computer fails to receive
proper input from the output board, the
computer display shows "E:SP."
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