How to interpret System Troubles with the D621 Keypad.

•  Zone 1 Lit steady = Telephone line Fail
•  Zone 1 Slow Flash = Comm Fail, Destination 1
•  Zone 1 Fast Flash = Comm Fail, Destination 2
•  Zone 2 Lit steady = Alternate Comm Trouble
•  Zone 3 Lit steady = Installer Switch Closed
•  Zone 4 Lit steady = Backup Battery low
•  Zone 4 Lit steady = Slow Flash = Backup Battery Missing
•  Zone 5 Lit steady = Bell Supervision Fail
•  Zone 6 Lit steady = RF Receiver Jamming
•  Zone 6 Slow Flash = RF Receiver Trouble
•  Zone 7 Lit steady = Data Bus Device Missing
•  Zone 7 Slow Flash = Data Bus Device Tamper
•  Zone 7 Fast Flash = Data Buss Device Trouble/Reset
•  Zone 8 Lit steady = System Fault
•  Zone 8 Slow Flash = Service Interval
•  Zone 8 Fast Flash = Ground Fault Condition

Press Cmd to return to the off state.