12836 doesn't look like any status code i've seen on these machines.
are you sure that is not the hour meter?
look on the controller and see if it has an led light
see if it is flashing in any sort of sequence.
the led will be either on the top of the unit or near the harness plug on that end of the box.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.