This was only part of the solution that fixed the problem. Changing the jumper settings seemed to be just as important. In fact I tried the resistor first and by itself it did not fix the problem. After changing the jumpers and adding the resistor the problem now seems to be gone.
Here's a quote from the earlier post where the jumpers are addressed:
"Re: iAqualink aux 4 thru 7 lights showing "on" on the in house Panel
I fixed this problem with the help of Jandy and without buying any parts.
The problem I had was with conflicting priorities of the controllers - the iaqualink and my RS8. The RS8 was set to a higher priority to the iaqualink. This was causing a conflict on the RS-485 bus.
So what you need to do is this:
1) first, verify you have a conflict by going to the Help menu on the iaqualink interface. If you click on "Next" a few times you will get to the RS-485 status screen.
2) make sure that your RS8 is set at a higher number than the iaqualink (higher number = lower priority). In my case the RS8 was set to 1 and the iaqualink to 4.
3) if your priorities need to be changed, there is a double jumper inside the iaqualink antenna and the RS8 that need to be changed. Turn off the control panel. Set the iaqualink jumper to ALL OFF (priority 1). Set the RS8 jumper to ALL ON (priority 4).
4) turn control panel back on and verify that the RS485 priorities are correct.
Since I made this change, I haven't had the phantom lights on the RS8 or lockups on the system.
Now if Zodiac is telling you to add components you might have a different problem than I had, but hopefully this might help someone else!"