Likely the sequence quit because the controller sees that the left-side folding flap is not in its open position. It is drooping, and you likely need to install a repair kit.
Any "Do It Your Self" mechanic can repair this inexpensively
0) 000989910310 - RM European Auto Parts, and it now being available as a special order item at NAPA, I wouldn't compromise the performance of the RST for a few bucks saved
The indicator is at the low point on the back of the tank