What are the common trouble codes displayed on the NFW2-100 LCD, and what does each one indicate?

The NFW2-100 (FireWarden-100-2) displays text-based device troubles and numeric system codes. Common device troubles include SHORT or OPEN for circuit faults, DIRTY1 or DIRTY2 for detectors needing cleaning (DIRTY2 is urgent), INVREP for hardware or invalid replies, TEST F for failed functional tests, INV ID for mismatched programming, and SW TBL for module relay failures (Page 127) [5].

System-level issues are identified by numeric codes:** 301** indicates AC power loss, 302 is low system battery, 310 signifies a ground fault, 311 means no battery is detected, and 335 indicates the local printer is out of paper (Page 148) [5].