Troubleshooting Guide for the Honeywell Notifier NFS 640 fire panel

Troubleshooting Guide for the Honeywell Notifier NFS 640 fire panel

The Honeywell Notifier NFS2-640 fire panel is a reliable system designed to safeguard various properties. This guide offers detailed instructions for

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The Honeywell Notifier NFS2-640 fire panel is a reliable system designed to safeguard various properties. This guide offers detailed instructions for users to resolve common issues with the panel and general maintenance tips.

Common faults with the Honeywell fire alarm system – Notifier NFS2 640

The following is a list of the common faults with an Honeywell fire alarm system, including user set-up and programming problems:

  • Honeywell fire alarm system buzzing / beeping: how to stop the buzzer on the Honeywell alarm – Notifier NFS2 640
  • Sounder going off: how to turn off sounder on Honeywell fire alarm
  • False alarming: how to stop a false alarm on the Honeywell fire alarm, and reset the panel
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How does the Notifier NFS2 640 operate?

Normal condition:

In normal mode, the Notifier NFS2 640 displays a “System Normal” message on the control panel. It performs several routine checks to ensure system integrity:

  • Polling: Checks SLC devices and NACs for valid replies, alarms, troubles, circuit integrity, and supervisory signals.
  • Power Supply: Monitors power supply troubles and batteries every 10 seconds.
  • Supervisory Query: Sends a query to the optional FDU-80 and verifies the response.
  • Display Updates: Refreshes the LCD and optional FDU-80 displays, and updates the system time.
  • Keypad Scanning: Scans for any keypad or Control Key entries.
  • Automatic Tests: Performs automatic tests on detectors and system memory.
  • Microcontroller Monitoring: Checks for microcontroller failures.

Fire condition:

When a fire alarm is triggered by an initiating device, the Notifier NFS2 640 performs the following actions:

  • Audible Tone: Produces a steady tone.
  • Alarm Activation: Activates the System Alarm relay and flashes the FIRE ALARM LED.
  • Status Display: Shows “ALARM” on the LCD display with specific device information.
  • Messaging: Sends alarm messages to the LCD display, remote annunciators, history buffer, installed printers, and CRT-2s.
  • Alarm Latch: The system remains in alarm mode until the condition is corrected and reset.
  • Control Actions: Initiates Control-By-Event actions and starts timers like Silence Inhibit and Auto Silence.
  • General Alarm: Activates the general alarm zone (Z00).
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How can I respond to a fire condition on the Notifier NFS2 640?

To respond to a fire alarm:

  1. Silence the Panel Sounder: Press the ACKNOWLEDGE/SCROLL DISPLAY key to silence the local sounder and change the FIRE ALARM LED from flashing to steady. This sends an acknowledge message to all relevant displays and logs.
  2. Silence All Outputs: Press the SIGNAL SILENCE key to silence the panel sounder and any silenceable outputs. The FIRE ALARM LED and SIGNALS SILENCED LED will light steady, and a Signal Silenced message is sent.
  3. Check and Correct: Check the alarm message for the location and type of trouble, correct the condition causing the alarm.
  4. Reset the System: After correcting the issue, press the SYSTEM RESET key to return the control panel to normal operation, indicated by the “System Normal” message. This sends a System Normal message to all relevant displays and logs.

How do I respond to a Mass Notification alarm on the Notifier NFS2?

If the control panel indicates an MN alarm, you can do the following:

To silence only the panel sounder:

  • Press the ACKNOWLEDGE/SCROLL DISPLAY key on a network control device.
  • The local sounder will silence. The control panel will send an acknowledge message to the LCD display, remote annunciators, history buffer, installed printers, and CRT-2s.
  • If multiple MN alarms are present on the fire panel, the ACKNOWLEDGE/SCROLL DISPLAY key must be pressed for each alarm.

To silence the panel sounder and any activated outputs that are programmed as silenceable:

  • Press the SIGNAL SILENCE key on a network control device. The FIRE ALARM LED and SIGNALS
  • SILENCED LED light steady.
  • The control panel sends an Signal Silenced message to the remote annunciators, history buffer,
  • installed printers, and CRT-2s. The figure below shows a sample Alarm Silenced message.
  • Correct the condition causing the MN alarm.
  • When you finish correcting the MN alarm condition, press the SYSTEM RESET key to return the control panel to normal operation (indicated by the “System Normal” message). The control panel sends a “System Normal” message to the LCD display, History buffer and installed printers, FDU-80 annunciators, and CRT-2s.
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How do I respond to a NAC or Control/Relay Trouble on the Notifier NFS2 640?


If the control panel indicates an active NAC or Control/Relay Trouble, take the following action:

  • Press the ACKNOWLEDGE/SCROLL DISPLAY key to silence the panel sounder and witch the
    SYSTEM TROUBLE LED from flashing to steady—regardless of the number of troubles, alarms,
    and supervisory signals.
  • The control panel sends an Acknowledge message to the History buffer and installed printers,
    FDU-80 annunciators, and CRT-2s. Check the trouble message for the location and type of
    trouble.
  • Correct the condition causing the trouble.
  • When the trouble condition is corrected, the panel will return to normal operation (indicated by
    the “System Normal” message).
  • The control panel sends a “System Normal” message to the LCD display, History buffer and
    installed printers, FDU-80 annunciators, and CRT-2s.

How do you reset the Notifier NFS2 640 panel?

To reset the panel:

  • Locate and press the SYSTEM RESET key on the control panel.
  • This action clears all active inputs, interrupts resettable power, and sends a “System Reset” message.

How do I silence the sounders on the NFS2 640 panel?

To silence the sounders:

Use the SIGNAL SILENCE key to silence the panel sounder and turn off all audio and visual devices connected to Notification Appliance Circuits. When pressed, the control panel does the following:

  • Turns off the panel sounder
  • Turns off all silenceable output circuits
  • Lights the SIGNALS SILENCED LED
  • Sends a SIGNALS SILENCED message to the History buffer and installed printers, CRT-2
    terminals, and annunciators
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How do I enable/disable a zone on the Notifier NFS2?

To enable/disable a zone:

  • Use the programming keypad to navigate to the desired zone.
  • Follow prompts on the keypad to enable or disable the zone.

How do I perform a lamp test on the NFS2 panel?

To perform a lamp test:

  • Press and hold the LAMP TEST key to activate the test.
  • This action lights all control panel LEDs and activates the panel sounder momentarily.

How do I perform a fire drill on the Notifier NFS2 640?

To perform a fire drill:

  • Press and hold the DRILL key for 2 seconds to initiate a manual drill.
  • This action activates all silenceable NACs and sends a Manual Evacuate message.
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How do I enable/disable the sounders on the Notifier NFS2?

To enable/disable the sounders:

  • Use the SIGNAL SILENCE key to enable or disable sounders.
  • Pressing this key silences the panel sounder and turns off audio/visual devices connected to Notification Appliance Circuits.

How do I silence the buzzer on the NFS2 640 panel?

To silence the internal buzzer:

  • Press the ACKNOWLEDGE/SCROLL DISPLAY key to silence the buzzer.
  • This action silences the piezo sounder on the panel and transfers the event to the history buffer.

Still, need help?

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Book an Honeywell fire alarm engineer to fix your Honeywell fire alarm fault

We’re specialists in helping fix problems with Honeywell fire alarm systems. If you want to fix a fault or book a maintenance engineer to service your Honeywell fire alarm, then get in contact with our team. Our fire alarm engineers can provide:

  • Fire alarm fault fix: our experienced fire alarm engineers can help fix problems with your Honeywell fire alarm
  • Maintenance service for Honeywell fire alarm: we have maintenance engineers who can visit your site and service your Honeywell fire alarm

Our fault-finding and maintenance engineers specialising in Honeywell alarms operate across the UK. We have Advanced fire alarm engineers in London, Birmingham, Cannock, Leeds, Manchester, Doncaster, Wakefield and York.  Book an engineer visit here  or email us at help@smartsecurity.support