Ceiling unit lit red in secondary bedroom

[Paddybc81]

Hi all.  FR ceiling module is all green. Noticed last week the ceiling module was red lit at ‘power’.  Unplugged the main ruckus box, waited 5 minutes and the FR rebooted and secondary bedroom started to reboot with 2 green lites then went red. Any suggestions ?  Also, I see a reset button inside - worth trying ?  And, my unit is only 8” from wall - how do you get the cover off the ceiling unit to see ?

TIA.