No Active Zones – 9998
This error will only appear if there is damage to the zone assignment circuit. It is not possible
to achieve this error under normal operating conditions.
Replace the control board to correct the error.
No Active Sensors – 9999
If all sensors are set as inactive at SW3 on the control board, this error code will appear.
Setting at least one active sensor and ensuring proper connection of that sensor to the control
board will remedy the error.
Checking and Replacing Fuses
The circuitry of all the detectors are protected by time-lag TR5 fuses. They are UL rated at 250
VAC, and manufactured by Littelfuse, series 374.
There are seven fuses on the interface board. The main fuse is located in FH1 and protects
the entire detector circuitry. This fuse has a rating of 2.0 Amps for 24 VAC units and 0.400
Amps for 120 VAC units..
Each pair of control relay contacts are protected by a TR5 time-lag fuse rated at 5.0 Amps.
These fuses are located in FH2 through FH7, and can be found along the left edge of the
interface board next to terminal strips TS2 and TS3.
Test these fuses by switching power off and removing them from their holders. Measure for a
low value of resistance across the pins. Replace any fuse that does not have a resistance
reading near 0 Ω. Always replace fuses with one having the same ratings and characteristics.
Two more TR5 time-lag fuses protect the input circuitry of the sensor board. The fuse located
at FH1 is rated at 1.0 Amp while the fuse located at FH2 is rated at 0.250 Amps. Test each
fuse for resistance and replace if the reading is not near 0 Ω.
IOM01
Rev 1.0 – December 22, 2020 35
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