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TM 40/40L, Rev (9) June 2015
4.2
Troubleshooting
This section is intended to be a guide to correct problems which may happen
during normal operation.
Table 18: Troubleshooting Table
Problem
Cause
Corrective Action
LEDs Off
Fault Relay at N.O
0-20mA at 0mA
No power at the
unit




Check that the correct power
is sent to the detector.
Check power polarity.
Check wiring in the detector.
Send the detector back for
repairs.
Yellow LED flashes
at 4 Hz
Fault Relay at N.O
0-20mA at 0mA
Fault Detector

Low Voltage

Faulty Detector

Yellow LED flashes
at 4 Hz
Fault Relay at N.O
0-20mA at 2mA
BIT Fault

Faulty Detector

Red LED
constantly on
If no fire exists,
then, detector
alarm latched
Perform Reset to the detector.
Alarm Relay at On
0-20mA at 20mA
Alarm condition






Troubleshooting
Check the voltage at the
detector; verify at least 24V
at the detector terminal.
Send the detector back for
repairs.
Clean detector window.
Re-power the detector.
Replace the detector.
Check cause for alarm.
If no alarm, re-power the
detector.
Send the detector back for
repairs.
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