Service and troubleshooting
8.16 EST3 Installation and Service Manual
3-OPS Off-Premises Signal module
Table 8-9: 3-OPS Off-Premises Signal module troubleshooting
Problem Possible cause
Module in trouble 1. Master box circuit open or not reset
2. Reverse polarity circuit open
3. 3.6 kΩ EOL resistor not installed on unused circuits
Remote receiver indicates
circuit trouble and does not
receive alarm
1. Circuit polarity reversed
2. Circuit open
3. Excessive circuit resistance
4. Incompatible receiver
5. Defective module
Remote receiver does NOT
indicate circuit trouble and
does not receive alarm
1. 3-OPS Not activated by panel (SDU database)
2. Incompatible receiver
3. Defective module
3-IDC8/4 Initiating Device Circuit module
Table 8-10: 3-IDC8/4 Initiating Device Circuit module troubleshooting
Problem Possible cause
Module in trouble
1. 4.7 kΩ EOL resistor not installed on unused IDC circuits
2. 15 kΩ EOL resistor not installed on unused NAC circuits
3. No communication with CPU module
4. Module not defined in SDU database.
5. Field wiring connector not plugged into module
NAC output not working 1. Jumpers installed incorrectly
2. External source configured but not connected
3. Circuit folding back due to overload.
4. Circuit “Silenced”
5. Circuit shorted
6. Polarized device defective or reversed on circuit
IDC circuit not working 1. Incompatible 2-wire smoke detectors
2. Excessive wiring resistance or capacitance
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