looking for a jandy controller expert for a problem jandy cant solve

[Franklin]

I have a jandy controller RS 8 with T revision
My heater is a jandy LXI which is plugged into slot 1 2 of the 10 pin connector not into the RS 485 4 pin port
and worked fine until recently now
The heater works fine in manual mode but I can no longer control it when the heater is set to be controlled by the jandy controller
Have spoken to zodiac tech support and they don't know what to do aside from have a service man come
Have reviewed the trouble shooting manual but there is nothing there

your help would be appreciated for suggestions re testing I do have a multimeter

thanks

 

[ps0303]

Tells us what you have already tried to resolve the issue. This way we can eliminate anything that Jandy had you do.

 

[Franklin]

replaced the controller wire and the thing works !!
they told me not to bother as it cannot be the wire but it seems like it was
fs