Removing the main plug from the 212 is not easy when the harness is too short. You may be able to reach it from underneath - there is a lock on the side of the plug hat you have to squeeze and then try jiggling it back and forth. It will come out eventually. Before doing that, however, I would try the following procedure: place the Store/Run switch in the "Store" position AND disconnect the negative terminal from the chassis battery under the hood for 15-30 seconds (NOT the coach battery). This removes the two sources of power from the unit and effectively resets it. It's been successful for a few owners on here. Good luck!
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