Is the IQ Remote up to date? You can update the IQ Remote by swiping down from the top of the screen > Settings > Enter Installer code (default 1111) or dealer code (default 2222) > IQ Remote PG Upgrade.
If it’s up to date or that doesn’t help, then try performing a master reset, then re-add the IQ Remote to the system. Steps to do so can be found here: