So either the actuator isn’t closing the diverter after spa mode or the diverter is bad.
Any ideas?
Ed
The Jandy actuator has internal cams for the micro switches that set where they stop in each position. Make sure they are properly set to fully close the diverter.
That is nasty. I assume it's related to the proximity to the SWCG, but I'm no expert on that. I hope that check valve is the problem, but I have to admit I wouldn't understand why because I have questions about your plumbing routes.
If that check valve replacement doesn't turn out to be the issue, I think we need to break down your plumbing into more detail. I know I'd like to see what the view is from the heater vantage point. For example, I can't see the output side of the SWCG. Does it just U around behind that control box to your return arrows? No need to answer this if the check valve replacement fixes the issue.
I replaced the check valve and it did not help. I didn’t think it would. Not sure I’ll have time today, but I’m going to pull apart the diverter / actuator to make sure it’s sitting right. I’ll also send new pictures to help clear up any plumbing questions.
Ed
Thanks for the new picture view. It doesn't spark any new ideas for me, sorry.
Hopefully the more experienced guys on here will chime in.