This is a new problem for me this year. I tried turned on the spa on one of the cold nights this week when it was below freezing (freeze protection was on). I turned it on from my phone (Pentair screen logic), but after 30 minutes I checked the temp and it had barely budged. I went outside and the valves were still in pool mode, so it was just heating the pool. I was able to change the valves using the manual switch on them, so the valves themselves were working, but the pool equipment didnt call for them to switch for some reason.
I tried again the next day when the temp was in the 40s and it worked fine, but when I tried later that night again after the temp had dropped below freezing and they didn't work. So its my guess that freeze protection is preventing the valves from switching.
This is my second winter with the pool, and last winter I never had this problem (we used the spa a lot during the winter). I did update my firmware earlier this year after I hit the unnamed brick issue with the ScreenLogic 2 adapter. I also had freeze protection enabled for both pool and spa for a lot of the winter last year until I discovered that I was losing a little bit of water from the spa everytime it switched between pool and spa mode, and after a few hours my spa was drained and my pump was left sucking air. So now I only have freeze protection enabled for the pool. I don't see anything in my pool configuration that would have changed that would explain this.
Does anybody know if this is expected? I'd like to be able to turn on the spa on some of these cold nights without going outside to manually switch the valves beforehand.
This is a Pentair Intellitouch i7 with the ScreenLogic2 interface.