Did you take the back up battery out when you unplugged it?
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This came out of the manual for the SRC Plus. lol at the size of the font. Best I could do.
Clearing the Controller's Memory/ Resetting the Controller
If you feel you have misprogrammed the controller, there is a process
that will reset the memory to factory defaults and erase all programs and
data that has been entered into the controller.
1. Press and hold down the , and buttons.
2. Press and release the reset button in the lower wiring compartment.
3. Release the , and buttons. The display should now show
12:00AM. All the memory has been cleared and the controller may
now be reprogrammed.