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Does your machine have a learning switch behind the seat, I think on the left side of the machine? If so, with the key off, place the switch in the up position, key on for 5 seconds, key off for 5 seconds, place the learning switch back into the middle position.
If that does not work, make sure the light on the PVC (pump and valve controller) is blinking about once a second. If it is not on, on steady or flashing codes, you have an issue.