Service and troubleshooting
8.50 EST3 Installation and Service Manual
Table 8-32: Signature module troubleshooting matrix
x x x x x x x Module missing or incorrectly wired on
Signature data circuit.
x x x x x x x Mapping error. Module not loaded into
Signature database
x x x x x x Ground Fault on input or output circuit
x x x Output circuit open, shorted, incorrectly
wired, polarized device installed in reverse,
incorrect or missing EOL resistor
x x x x x Missing or incorrect EOL resistor (P-codes 1,
2, 3, 4, 13, 14, 16, 18, 20, 21)
x 24 Vdc for smoke power low or missing
(P-codes 13, 14, 18, 20, and 21)
Module incorrectly in alarm or active on Signature controller module
x x x x x Initiating device circuit shorted or initiating
device incorrectly installed
x x x x x Incorrect EOL resistor value (too low)
x = Applicable for module
This table also applies to equivalent M-series components and products that emulate these
module types.
Table 8-33: Signature detector troubleshooting
Symptom Possible causes
Detector not responding
correctly
1. Detector installed in wrong location or improperly addressed.
2. Detector not entered in system database.
3. Incorrect device response in database.
Detector in trouble on CPU 1. Detector missing or incorrectly wired on Signature data
circuit.
2. Mapping error. Detector not loaded into control module
database.
3. Ground Fault on Signature Data circuit
4. Internal detector fault. Refer to Advanced Techniques
Section.
Detector incorrectly in alarm
on control panel.
1. Detector extremely dirty.
2. Ionization detector installed in area of extremely high airflow.
3. Detector installed in area of high ambient smoke.
4. Defective detector.
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