OPEN: NFW2-100 Trouble Code | Fire Alarm Resource Center

What This Code Means

This trouble description indicates an open circuit condition on an addressable device or a notification appliance circuit (NAC).

Common Causes

1Open circuit on an addressable device
2Broken wire or loose connection on the SLC loop
3NAC circuit voltage in the range of -2.3 to -2.5 VDC
4Missing or incorrect 4.7 k ohm End-of-Line resistor on a Style Y (Class B) NAC

Resolution Steps

Pressing the Acknowledge/Step or Alarm Silence key will cause the pulsing piezo to silence and the system Trouble LED to change from flashing to on steady. Locate the device or circuit indicated on the display and check for an open circuit condition, ensuring all wiring is intact and connections are secure.

Manual References(1)

1notifierNFW2-100Installation2005p. 127, 139, 172, 3, 2 +17Open

Related Codes

INVREPInvalid reply from the addressable device, indicating a hardware problem.COMM FAULT 1The control panel has failed 10 total attempts to communicate with the primary Central Station phone number.DUCT SUPERVISORYA supervisory condition has been triggered by a duct smoke detector.NAC 1 FAULTA fault condition (open or short) on Notification Appliance Circuit 1.DIRTY2Maintenance alert indicating that a detector needs immediate maintenance due to being within 80% of its alarm threshold for 24 hours.

Notifier NFW2-100

What This Code Means

Common Causes

Resolution Steps

Manual References(1)

Field Notes

Related Codes

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