is there a click when you push the stick forward...
.if so the relay might be caput...
...that is the only thing that has ever gone in any of my electronize esc...
.and I had 10 fr30's in different lifeboats at the same time...
..I have two in my two lifeboats that you saw the other day, one in my st200 launch, and one sat on the bench in my workshop...
...are you using one esc on a Y connector to the two motors by any chance...
.if you are, the power and draw on those big rascals might have blown it...
I will be in my workshop tomorrow afternoon, if you want to come down and test it on a smaller motor we can see if it's kaput
...electronise have a standard price for looking at them for repair, and then what ever is needed to repair is on top.
did you have a protective in line fuse fitted to the red wire at all as they are pretty robust esc's usually..
compatibility shouldn't be a problem...
..my esc's work with 27mhz, 40, 2,4ghz...
...and even had one working on 35mhz...
..although it was only to test the tx/rx that I was selling for an aero modeller friend some time ago.
neil.