I know this is an old posting but ran across the same problem as john and thought it may help someone in the future. I recently purchased the SS13A to control a new module. It was the first module I attempted to control on the B housecode. The module worked through AHP but when the new SS13A was used, AHP would flip the switch in the program, but had no effect on the module. A and B housecodes were both checked in AHP but the Auto button was selected. When I switched from Auto to Specific and re-downloaded into the CM15A the unit responded as hoped. Worth a try if you are having troubles with this.