wlardin

Michel, Thanks! I followed the procedure you recommended, step-by-step, and it system now works as expected. The *_Control indicators are correct, as are the current temperature and setpoint values. Now I can write programs to respond to events of the HVAC system. Thanks again, -will

I also have a T1800 and V2441V which I installed about a week ago. ISY device reports the thermostat adapter as V.91, but the physical unit has a label of V2 on it. I can control the thermostat without a problem, however it's largely just one-way: my thermostat reports no status changes (setpoints, heat, cool, or fan control) and only the current state when queried. Even when I place an AP directly next to the 2441 using an extension cord, nothing is reported. I've also tried re-linking a number of times in accordance with the procedure outlined in the 26/99 wiki. The nearest AP is v1. I also have one plugged into the ISY's PLM, and one to reach a triggerlinc in a storage building about 30' from the house. All three APs are v1. Unlike JP, my powerline is quite clean, judging by an O-scope (except when the dryer is running, but even that doesn't cause problems). Might this indicate a defective thermostat adapter? Should I replace the nearest AP with a new V2? As for the ISY identifying the 2441 as V.91... Should this be a concern or is it expected? Advice would be appreciated. For further info purposes: I recently upgraded to 2.8.4. No problems that weren't there under 2.7.15. Thanks, -will