Master Alarm(s) OC or SC
Master alarm wiring open or short circuit
The panel has detected an open-circuit or short-circuit fault on the master alarm wiring.
What this code means
The panel has detected an open-circuit or short-circuit fault on the master alarm wiring.
Possible causes
- Open circuit in alarm wiring
- Short circuit in alarm wiring
- End-of-line device missing or disconnected
Common symptoms
- Master Alarm(s) OC or SC message
- Fault indication
- Sounder indication may be present
Checks to make
- Check the master alarm wiring
- Confirm the end-of-line device is correctly connected
- Repair the field wiring fault and verify the panel returns to normal
Safety
- Sounder/alarm circuit impairment affects life-safety coverage. Manage the impairment and use competent fire-alarm personnel.
Model notes
The exact message may include a circuit number.