Pressing the AWC button will not start the AWC sequence that I know of. You may be able to setup and output to turn on during the AWC mode and use that to start the AWC. You might want to get with support on this as Jeff suggested since they will be able to check things on you system we cannot do here.I'll play with that later today (or in the next day or two).
Do I have to have a schedule? Can I leave the schedule out so I can just run it on demand by clicking the AWC button on the status page?
On my AWC I just took a Intllab dosing pump and modified it to a dual head dosing pump. I have photos of doing that on my build thread if you are into that type of thing. I did find out it is best to clean the heads and use tubing from the same length of tubing to get them to pump close enough to use. I got spare tubing when I got the pumps off Amazon. I have a low level sensor and a High level sensor if something were to happen. That would shutdown the AWC pump. Since it is draining and filling at the same time the level should not change. I drain from the refugium section of the sump, and fill to the return pump section. I have also used 2 Intllab dosing pumps to do this also. You just have to get then plumb up. adjust one pump for the flow rate you want the pump to run at and instead of draining and filling from the sump place them in a container with a known amount of water. Then adjust the other pump to match the flow rate of the other. When they match the water level should remain the same in the container.