All that watchdog needs to light is a good CLC, good software, and good 5vdc. Also seen the light fail to come on with excessive AC on the 5v. You don’t have a comm problem but a CLC not booting up problem. I don’t know about that soldered in M1 chip on that World board. I’ve never seen that. Might check with World on what software it needs. All I ever install is DK13 but the 15 may have door lock monitoring. And ya, all software in the group has to match for group comm.