What do the detector sensitivity status messages mean on the 6820?
'NORMAL' means the detector is in compliance with NFPA 72. 'CAL MAINT' means the detector is in compliance with NFPA 72 but maintenance should be performed soon, while 'CAL TRBLE' means the detector is not in compliance with NFPA 72. (Page 1)
From the official Honeywell 6820 manual, page 1
Have a follow-up question?
Answers from the official manual.
Common questions