Note: if there are any splices or if you extended your control arm cables, remove the added wire and test.
First turn off the system, disconnect and reconnect the 2nd operator wires. Test the system by turning back on.
If the error went away, it was connection issue. If notcontinue to Step 2
Turn the system to the off position and remove the wires connected to the 2nd operator terminal. With the wires disconnected turn the system back on.