Napco Gem P400 Trouble
| Press FUNCTION + 4 to view trouble | |
| 1 Beep and Zone 1 | AC Power Failure |
| 1 Beep and Zone 2 | Low Panel Battery |
| 1 Beep and Zone 3 | Communication Failure |
| 1 Beep and Zone 4 | Telephone Line Cut or not working |
| 2 Beeps and Zone 1 | Bell/Siren Trouble |
| 2 Beeps and Zone 3 | Wireless Receiver Trouble |
| 2 Beeps and Zone 4 | Wireless Receiver Jam (Bad Wireless Receiver) |
| 3 Beeps and any Zone | Transmitter Low Battery (Zone light indicates which zone ) |
| 4 Beeps and any Zone | Wireless Sensor Failure |
| 5 Beeps and any Zone | Wireless Smoke Detector Low Battery |
| 6 Beeps and any Zone | Wireless Smoke Detector Supervisory Trouble |
| 7 Beeps and any Zone | Zone Trouble |
| Reset Smoke |
Press RESET (If this does not work powere down, set for service) |