I can help you out here. On your model, only those 2 buttons should work.
Regarding the caddy, there is a plastic insert piece that goes across the back portion of the caddy (I circled it in yellow in the pic) to raise the rear portion of the unit up so it doesn't rub the wheels. If you bought the older model caddy, there are 3 additional pieces you have to buy to convert it to fit your new unit. Look at the picture I attached and you will see the 3 pieces I circled. These are the 3 additional pieces that are needed to convert the caddy to the newer model to fit your unit. The piece that is circled in yellow is the piece that you need to give it the extra bit of height for wheel clearance. To attach it, you simply just push it down until it pops in place in the middle.
The power supply was also moved on the newer unit which now hangs off the top piece that I circled in red (top small red circle). On the older model caddy the power supply box would drop in the bottom portion where the bigger red circle piece is covering it now. On the newer caddy, you will need that cover (biggest red circle at bottom) to insert over the hole area, this is where the cord wraps around now. Hope that helps! Let me know if you have any other questions.
Maytronics also knows exactly which 3 pieces are needed and you can get it from them directly.
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