I deleted a Zone from my Orion 700 and now several heater receiver ID numbers have vanished from the Orion 700 memory

The only way to recover from this is to perform a Factory Reset on the Orion 700 and begin setup from afresh.

Deleting a Zone with receiver IDs associated with the Zone will cause the receiver IDs to disappear.

If a Zone is no longer required, you should use the “move” function to move the receiver IDs to another Zone before deleting the unwanted Zone name.