Pool and Spa
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I think you might have a defective receiver, if several Jandy PDs don't and won't pair with it. It couldn't just be one PD gone wrong... provided you haven't had the whole system and the PDs on idle all winter season and neglected to check battery freshness in the PDs or replace battery/batteries in even one of them... ?
Did you test with more than one remote?
Or do you have only one remote to test with?
What is the exact message on the remote you have tested with?
Then either the remote, or the receiver that it interfaces with, is defective.
I'm not sure how to determine which, but examine the receiver also, see if there are any indicator lights, re-seat connections with power Off, then power On and try again.
What model is the Jandy for the pool?
Has it worked previously? if so, how long ago?
If the dials don't provide control, there probably is no way of getting control over it except through a different PD or a different receiver module.
"Press and release the Mode button and select SPA or POOL operation, and it may manage to some extent by itself.
(But - is there a MODE button anywhere but on the PD ? that's the issue here.)